PATENT DOCUMENT

Publication Number: US-9273980-B2
Application Number: US-201314056443-A
Country: US
Kind Code: B2

Title: Direction list

Abstract:
A mapping application that intelligently places distance labels along a route in a map is disclosed. A distance label placed at a particular position of the route shows the distance to the particular location from the starting point of the route. Distance labels allow the user of the map to quickly appreciate the distances between the various points of interest (e.g., maneuvers) along the route. In some mapping applications that display the route as a list of driving directions, the distance labels are placed alongside the list of driving directions, and each distance label is associated with a maneuver in the list of directions.

Claims:
What is claimed is: 
     
       1. A non-transitory computer readable medium storing a computer program for execution by at least one processor, the computer program comprising sets of instructions for:
 displaying a route on a map, the route comprising a plurality of maneuvers for traveling from a starting location to an ending location; 
 providing a list of directions based on the route, the list of directions comprising a plurality of items, each item corresponding to a maneuver in the route; 
 receiving a selection of an item in the list of directions; and 
 changing a view of the map from a first view that includes a currently viewed position to a second view that includes a position of a maneuver that corresponds to the selected item by transitioning through a third view that encompasses both the currently viewed position and the position of the maneuver that corresponds to the selected item. 
 
     
     
       2. The non-transitory computer readable medium of  claim 1 , wherein the program further comprises a set of instructions for providing a plurality of distance labels along the route on the map. 
     
     
       3. The non-transitory computer readable medium of  claim 1 , wherein the set of instructions for changing the view of the map comprises a set of instructions for zooming out to encompass both the currently viewed position and the position of the selected maneuver. 
     
     
       4. The non-transitory computer readable medium of  claim 1 , wherein the set of instructions for changing the view of the map comprises a set of instructions for panning from the currently viewed position to the position of the selected maneuver if both the currently viewed position and the position of the selected maneuver can fit within a same view at a current zoom level. 
     
     
       5. The non-transitory computer readable medium of  claim 1 , wherein at least some of the items in the list of directions are associated with distance labels. 
     
     
       6. The non-transitory computer readable medium of  claim 5 , wherein at least some of the items in the list of directions are not associated with distance labels. 
     
     
       7. A method of providing a graphical user interface (GUI) for a mapping application, the method comprising:
 providing a map viewing area for displaying a map and a route that comprises a plurality of maneuvers for traveling from a starting location to an ending location; 
 providing a list view area for displaying a list of directions based on the route, the list of directions comprising a plurality of items, each item corresponding to a maneuver in the route; 
 receiving a selection of an item in the list of directions; and 
 changing a view of the map in the map viewing area from a first view that includes a currently viewed position to a second view that includes a position of a maneuver that corresponds to the selected item by transitioning through a third view that encompasses both the currently viewed position and the position of the maneuver that corresponds to the selected item. 
 
     
     
       8. The method of  claim 7 , wherein changing the view of the map comprises zooming out to encompass both the currently viewed position and the position of the selected maneuver. 
     
     
       9. The method of  claim 7 , wherein changing the view of the map comprises panning from the currently viewed position to the position of the selected maneuver if both the currently viewed position and the position of the selected maneuver can fit within a same view at a current zoom level. 
     
     
       10. A method comprising:
 displaying a route on a map, the route indicating a path from a starting location to an ending location; 
 generating a list of directions based on the route, wherein the list of directions comprises a plurality of steps for traveling on the route; 
 associating a plurality of distance labels with at least some of the steps in the plurality of steps, wherein each distance label indicates a traveling distance along the route; and 
 displaying the plurality of distance labels along the list of directions and along the route displayed on the map. 
 
     
     
       11. The method of  claim 10  further comprising determining placement of the plurality of distance labels along the route. 
     
     
       12. The method of  claim 11 , wherein determining placement of the plurality of distance labels along the route comprises determining a segment unit value based on a set of numbers having two or less significant digits. 
     
     
       13. The method of  claim 12  further comprising computing a lower bound value for the segment unit value based on a target number of distance labels and a length of the route. 
     
     
       14. The method of  claim 13  further comprising computing a logarithmic value of the lower bound value. 
     
     
       15. The method of  claim 11 , wherein the placement of the distance labels along a particular section of the route is at least partially determined by the number of steps within that section of the route. 
     
     
       16. The method of  claim 10 , wherein associating the plurality of distance labels with the plurality of steps comprises distributing the distance labels evenly among the plurality of steps in the list of directions. 
     
     
       17. The method of  claim 10 , wherein the distance measure is measured from the starting location of the route. 
     
     
       18. The method of  claim 10 , wherein the number of distance labels in the plurality of distance labels is a predetermined number that is independent of an actual length of the route. 
     
     
       19. The method of  claim 10 , wherein at least some of the distance labels are placed near the beginning and the end of the route. 
     
     
       20. A non-transitory computer readable medium storing a computer program for execution by at least one processor, the computer program comprising sets of instructions for:
 displaying a route on a map, the route indicating a path from a starting location to an ending location; and; 
 displaying a list of directions based on the route, wherein the list of directions comprises a plurality of maneuvers along the route; 
 displaying a plurality of distance labels along the route on the map and along the list of directions, wherein each distance label indicates a distance measure for a point of interest in the route that indicates a traveling distance on the path, wherein each distance label is associated with one maneuver in the list of directions. 
 
     
     
       21. The non-transitory computer readable medium of  claim 20  further comprising a set of instructions for displaying the list of directions and a set of instructions for displaying the distance labels along the list of directions. 
     
     
       22. The non-transitory computer readable medium of  claim 21 , wherein the list of directions is represented by a plurality of graphical items, each graphical item representing a maneuver from the plurality of maneuvers, wherein the set of instructions for displaying the plurality of distance labels comprises a set of instructions for displaying the distance labels within some but not all of the graphical items in the list of directions. 
     
     
       23. The non-transitory computer readable medium of  claim 20  further comprising a set of instructions for printing the list of directions. 
     
     
       24. The non-transitory computer readable medium of  claim 23  further comprising a set of instructions for printing the plurality of distance labels along the printed list of directions. 
     
     
       25. The non-transitory computer readable medium of  claim 24 , wherein the set of instructions for printing the plurality of distance labels comprises a set of instructions for printing the distance labels adjacent to some but not all of the entries in the list of directions. 
     
     
       26. The non-transitory computer readable medium of  claim 20 , wherein at least some of the points of interest along the route are maneuvers from the plurality of maneuvers. 
     
     
       27. The non-transitory computer readable medium of  claim 20 , wherein the number of distance labels in the plurality of distance labels is a predetermined number that is independent of a length of the route. 
     
     
       28. The non-transitory computer readable medium of  claim 20 , wherein each distance label indicates an expected travel time from the starting location. 
     
     
       29. The non-transitory computer readable medium of  claim 20 , wherein each distance label indicates an expected travel time to reach the ending location.

Description:
CLAIM OF BENEFIT TO PRIOR APPLICATIONS 
     This present Application claims the benefit of U.S. Provisional Patent Application 61/832,905, filed Jun. 9, 2013. U.S. Provisional Patent Applications 61/832,905 is incorporated herein by reference. 
    
    
     BACKGROUND 
     Many map-based applications available today are designed for a variety of different devices (e.g., desktops, laptops, tablet devices, smartphones, handheld global positioning system (GPS) receivers, etc.) and for various different purposes (e.g., navigation, browsing, sports, etc.). In addition to presenting two-dimensional (2D) maps or three-dimensional (3D) maps, these applications generally have the capability of computing, when given a starting location and a destination location, one or more routes. Such a route generally consists of a number of driving directions or traffic maneuvers that a driver or a traveler can follow in order to reach the destination. These directions or maneuvers are usually presented graphically within the map (2D or 3D), and/or in a list of directions. 
     Many mapping applications use both map and list of directions to present the route to the user. Presenting the route in a 2D or 3D map is advantageous because a user can quickly and easily visualize his journey spatially by viewing the map. However, a map is generally not the best setting for presenting all of the necessary information of the route, since these information may clutter the view of the map and visually overload the user. Many mapping applications therefore relay on the list of directions to present all of the necessary information regarding each step or maneuver of the route. 
     Most mapping applications present the list of directions as a series of textual items. However, these textual items are usually difficult to follow visually, especially when the user of the application is driving while trying to follow the route. Furthermore, the user of the list of directions often finds it difficult to correlate the information on the list of directions with information presented graphically in the map. This is especially problematic for the user of the map, who often needs to turn to the list of directions in order to find out the distances between the various points of interest on the route. 
     SUMMARY 
     Some embodiments provide a mobile device that displays a list of traveling maneuvers or driving directions according to a route from a start location to a destination location. The displayed list includes a series of graphical items that each corresponds to a maneuver in the route. The displayed list of driving directions is updated dynamically according to the current position of the mobile device. Each maneuver actually taken or traveled causes the mobile device to display the item that corresponds to the taken maneuver differently. After a number of maneuvers have been taken, the graphical items that correspond to the taken maneuvers are removed from display and new maneuvers are brought into view. 
     Some embodiments provide a mapping or navigation application that intelligently places distance labels along a route in a map. A distance label placed at a particular position of the route shows the distance to the particular location from the starting point of the route. Distance labels allow the user of the map to quickly appreciate the distances between the various points of interest (e.g., maneuvers) along the route. In some embodiments that display the route as a list of driving directions, the distance labels are placed alongside the list of driving directions, and each distance label is associated with a maneuver in the list of directions. 
     In some embodiments, individual steps or maneuvers in the list of directions are selectable items in the GUI. The selection of a GUI item that corresponds to a particular maneuver in the list of directions causes the view of the map to move toward a location on the route that corresponds to the particular maneuver. When the user selects a new maneuver from the list of directions, some embodiments animate a transition from a previous view for a previously selected maneuver to a new view for the newly selected maneuver. In some embodiments, the transition includes zooming out to temporarily include both the previously selected maneuver and the newly selected maneuver before zooming in at the newly selected maneuver. 
     The preceding Summary is intended to serve as a brief introduction to some embodiments of the invention. It is not meant to be an introduction or overview of all inventive subject matter disclosed in this document. The Detailed Description that follows and the Drawings that are referred to in the Detailed Description will further describe the embodiments described in the Summary as well as other embodiments. Accordingly, to understand all the embodiments described by this document, a full review of the Summary, Detailed Description and the Drawings is needed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The novel features of the invention are set forth in the appended claims. However, for purpose of explanation, several embodiments of the invention are set forth in the following figures. 
         FIG. 1  illustrates a user interface for a mobile device that displays a list of directions. 
         FIG. 2  illustrates the creation of a list of directions by a mapping application running on a mobile device. 
         FIG. 3  illustrates the correspondence between the dynamic display of the list of directions in a mobile device and the current position of the mobile device. 
         FIG. 4  illustrates the dynamic display of the list of directions during navigation operations by a mobile device. 
         FIG. 5  conceptually illustrates a process for dynamically updating a list of directions. 
         FIG. 6  illustrates the placement of distance labels on a route in a map. 
         FIG. 7  illustrates distance labels that are placed along a list of directions and along a route in the map. 
         FIG. 8  conceptually illustrates a process of some embodiments for determining the placement of the distance labels along a route. 
         FIG. 9  illustrates a process for computing a desirable segment unit value as well as a suitable number of segments for the placement of distance labels along the route. 
         FIG. 10  illustrates the placement of distance labels based on where the maneuvers are in the route. 
         FIG. 11  illustrates a printed list of directions that includes distance labels. 
         FIG. 12  illustrates a mapping application in which the distance labels along the route in the map window, along the list of directions, and in the print out are not the same. 
         FIG. 13  illustrates a mapping application that displays distance labels only along a list of directions but not along a route in a map. 
         FIG. 14  illustrates a mapping application that includes distance labels along with a print-out of a list of directions but does not display distance labels at all in its GUI. 
         FIG. 15  illustrates a GUI of a mapping application that displays the distance labels along a route in a map window and includes the distance labels in a print-out of a list of directions, but does not display the distance labels along the list of directions within the GUI. 
         FIGS. 16-17  illustrate a mapping application that changes zoom level as it changes the view of the map due to the selection of a maneuver from a list of directions. 
         FIGS. 18-19  illustrate changing the view of the map due to the selection of a maneuver item that is far away from the original view. 
         FIGS. 20-21  illustrate changing the view of the map due to the selection of a maneuver item that is near the original view. 
         FIG. 22  conceptually illustrates a process for transitioning the view of the map when a maneuver in the list of directions is selected. 
         FIG. 23  is an example of an architecture of a mobile computing device of some embodiments. 
         FIG. 24  conceptually illustrates an example of an electronic system with which some embodiments of the invention are implemented. 
         FIG. 25  illustrates a map service operating environment, according to some embodiments. 
     
    
    
     DETAILED DESCRIPTION 
     In the following description, numerous details are set forth for the purpose of explanation. However, one of ordinary skill in the art will realize that the invention may be practiced without the use of these specific details. In other instances, well-known structures and devices are shown in block diagram form in order not to obscure the description of the invention with unnecessary detail. 
     In order to present traveling directions in a way that is easy for a user to follow while driving, some embodiments provide a mobile device that presents a list of directions that is dynamically updated according to the present position of the mobile device. To aid the user&#39;s spatial comprehension of the route, some embodiments present a series of distance labels along the route in the map as well as in a list of directions. And to better integrate the user&#39;s understanding of the route from the list of directions and from the route on the map, some embodiments change the view of the map to match the user&#39;s selection of a particular item in the list of directions and to animate the change in the view. 
     Several more detailed embodiments of the invention are described below. Section I describes list of directions that are updated dynamically according to the present position of a mobile device. Section II describes distance labels that are presented along a route in several formats. Section III describes a mapping application that animate changes in view of the map when the user selects a particular item in the list of directions. Section IV describes an electronic system with which some embodiments of the invention are implemented. Section V describes a mapping service environment within which some embodiments of the invention operate. 
     I. Dynamic Directions 
     Some embodiments provide a mobile device that displays a list of steps, traveling maneuvers, or driving directions according to a route from a start location to a destination location. The displayed list of includes a series of graphical items that each corresponds to a step or maneuver in the route. The displayed list of driving directions is updated dynamically according to the current position of the mobile device (or the position of the vehicle or person carrying the device). Each maneuver actually taken or traveled causes the mobile device to display the item that corresponds to the taken maneuver differently (e.g., in a different color). After a number of maneuvers have been taken, the graphical items that correspond to the taken maneuvers are removed from display and new maneuvers are brought into view. 
     For some embodiments,  FIG. 1  illustrates a user interface for a mobile device  100  that displays a list of directions  110 . The list of directions  110  is a set of instructions for taking a traveler from a point of origin (or a starting location) to a point of destination (or an ending location) on a suggested route. The list of directions  110  includes a list of entries, each entry corresponding to a direction, instruction or a maneuver for the traveler to follow according to the route. A traveler is a person or a vehicle traveling on the road whose position is used as the current position for the mapping or navigation application. In some embodiments, the traveler is carrying the mobile device  100  and thus the current position of the mobile device is the current position of the traveler. A maneuver in the list of directions in some embodiments can be a traffic turn, entrance into a freeway, continuing on a freeway, exit from a freeway, departure from the point of origin, arrival at the point of destination, or other actions that a driver or a traveler needs to take in order to follow the route to the destination. 
     In some embodiments, the display of the list of directions is controlled by a route inspection engine that automatically steps through items in the list of directions when position indication functionality of the mobile device is activated. The mobile device  100  in some of these embodiments is able to determine its own position and then uses that position to dynamically update the display of the list of directions  110 . In some embodiments, the mobile device  100  automatically scrolls through individual entries of the list of directions according to its own instantaneous actual location (and hence actual location of the traveler carrying the mobile device). 
     The mobile device  100  can be any mobile computing and communication devices such as mobile phones, hand-held navigation devices, laptops, or PDAs. It is a device capable of determining its own location and relaying that information to an application running on the device. In some embodiments, the mobile device  100  is equipped with global positioning system (GPS) capabilities for determining its own position. In some embodiments, the mobile device  100  runs applications that use the location information of the mobile device to perform turn-by-turn navigation or mapping operations. In some embodiments, the mobile device acts as a client device to a mapping service and receives mapping information and other mapping related data from the mapping service. 
       FIG. 1  illustrates the dynamic display of the list of directions  110  by the mobile device  100  in four stages  101 - 104 . At the first stage  101 , the mobile device  100  is displaying graphical items  111 - 114 , which graphically represent four entries in the list of directions  110 . The mobile device  100  is configured to display at most four maneuvers at a time, even though the list of directions  110  can include more than four entries. 
     Except for the first entry, each entry in the list of directions  110  describes a maneuver that is to be performed some distance after a previous maneuver. For example, the maneuver (represented by graphical item)  114  is to be performed 0.7 miles after the maneuver  113 , the maneuver  113  is to be performed 0.2 miles after maneuver  112 , the maneuver  112  is to be performed 0.9 miles after the maneuver  111 , and the maneuver  111  is to be performed 0.1 miles after a previous maneuver that is not being displayed. Each maneuver entry in the list of directions therefore also represents a segment of the route that is between the previous maneuver and the maneuver associated with the entry. For example, the graphical item  113  represents a segment of the route between the maneuver  112  “turn left onto Pack Road” and the maneuver  113  “turn left onto Lion Road”, and that the length of the segment is 0.2 miles. 
     Each of the graphical items  111 - 114  displays information for its associated maneuver. In some embodiments, the information is presented via a set of indicators. For example, the graphical item  112  includes a graphical direction indicator  121 , a distance indicator  122 , and a detailed description  123  for the maneuver “Turn Left onto Pack Road”. The graphical direction indicator  121  is a prominent visual cue of the maneuver, in this case an arrow pointing to the left to indicate a left turn. The detailed description  123  is a textual description of the maneuver that provides the type of the maneuver (left turn) as well as the location of the maneuver (Pack Road). The distance indicator  122  is a distance measurement based on the position of the maneuver. In some embodiments, this is a distance measurement from the previous maneuver (i.e., the distance from the maneuver of  111  to the maneuver of  112 ). One of ordinary skill would understand that different embodiments present the information for the maneuvers differently. For example, some embodiments include an expected time to travel indicator in the graphical item, the expected time to travel being based on a predicted traveling speed. 
     Some embodiments visually distinguish graphical items that correspond to completed maneuvers from those that are yet to be taken by the mobile device. In some embodiments, a graphical item that corresponds to a completed maneuver remains in the display of the mobile device, but in a visually less prominent way. As illustrated, the graphical item  111  has been grayed-out while the graphical items  112 - 114  remain in black, indicating that the traveler carrying the mobile device has completed the maneuver  111  but not maneuvers  112 - 114 . Based on the differential appearances of the graphical items, the user of the device would understand that the traveler has made the right turn onto Hill Road ( 111 ), and a left turn onto Pack Road ( 112 ) is coming up next. In other words, the graphical item  112 , being the first graphical item that has not been grayed-out, corresponds to a segment of the route that the traveler carrying the mobile device is currently traveling on. In some embodiments, a graphical item that corresponds to the immediately upcoming maneuver (such as  112 ) would further include an indicator (not illustrated) for indicating the distance between the current position of the mobile device and the upcoming maneuver. 
     At the second stage  102 , the traveler carrying the mobile device has completed another maneuver, namely, the left turn on Pack Road associated with the graphical item  112 . The mobile device has in turn received updated position information (e.g., GPS coordinates) about the traveler to know that the traveler has completed the left turn on Pack Road. As a result, the mobile device grays out the graphical item  112 . At this stage, both graphical items  111  and  112  have been grayed-out to indicate that both of these maneuvers have been completed, and are hence obsolete. 
     The dashed arrow in stage  102  is for illustrating that the mobile device is in the process of updating or refreshing the display by removing the obsolete maneuvers to make room for new maneuvers from the list of directions  110 . In some embodiments, the display update is accomplished by scrolling the list of directions  110  such that the grayed-out items  111  and  112  are scrolled off the display while the new graphical items  115  and  116  are scrolled into the display. Some embodiments animate this process of updating the display by gradually scrolling the list of directions  110 , or by fading-out obsolete items and fading-in new items from the list of directions  110 . 
     At the third stage  103 , the mobile device has completed the process of updating its display of the list of directions  110  to remove the graphical items  111 - 112  and to include the new graphical items  115  and  116 , which correspond to maneuvers that immediately follow the maneuver  114 . Since the obsolete graphical items have been removed, none of the displayed maneuvers are grayed-out. The user of the mobile device would therefore understand that the first displayed maneuver, i.e., the graphical item  113  “turn left onto Lion Road”, corresponds to the immediate upcoming maneuver. Some embodiments display the item for the upcoming maneuver in a different, more conspicuous manner than other items in the list of directions. 
     At the fourth stage  104 , the traveler carrying the mobile device has completed the upcoming maneuver, namely, the left turn on Lion Road associated with the graphical item  113 . The mobile device in turn grays out the graphical item  113  to indicate that the traveler has completed the maneuver. 
     In the example illustrated by  FIG. 1 , the mobile device allows its display to accumulate two obsolete maneuvers (e.g., graphical items  111  and  112  in stage  102 ) before refreshing the display by removing or scrolling off all of the obsolete maneuvers. Different embodiments handle the display refresh of the list of directions differently. In some embodiments, the mobile device refreshes the display (by e.g., removing or scrolling off the maneuvers that have already been taken) when there is at least one obsolete maneuver in the list of directions. In some embodiments, the mobile device accumulates three or more obsolete maneuvers before refreshing. In some embodiments, the mobile device refreshes its display by removing only some but not all of the obsolete maneuvers. For example, in some embodiments, the mobile device going from stage  102  to  103  removes only the maneuver  111  but leaves maneuver  112  in the display, even though both maneuvers  111  and  112  have become obsolete. In some embodiments, the mobile device allows each obsolete maneuver to stay in the list of directions for a predetermined amount of time before removal so that the change in appearance (e.g., gray-out) of the graphical item that corresponds to the taken maneuver is observable by the user. In some of these embodiments, the timing for the removal of the obsolete maneuvers is independent of how many obsolete maneuvers are in the list of directions. 
     As mentioned, the list of directions  110  is a set of instructions for taking a traveler from a point of origin to a point of destination on a suggested route. In some embodiments, the list of directions is created by a mapping or navigation application that determines one or more routes from the point of origin to the point of destination and then generates the list of directions based on one of the determined routes. The mapping or navigation application can be an application running on a mobile device that is being carried by the traveler, which then displays the generated list of directions dynamically based on the position of the traveler carrying the mobile device. The mapping or navigation application can also be an application running on a computing device that is not being carried by the traveler, but nevertheless is capable of computing a route and generating a list of directions for the traveler. 
     For some embodiments,  FIG. 2  illustrates the creation of a list of directions by a mapping application running on a mobile device  200 . The mapping application allows the user to enter a start location and an end location, computes one or more routes, then generates a list of directions  210  based on a route that can take a traveler from the start location to the end location. The generation of the list of directions is illustrated in six stages  201 - 206 . 
     The first stage  201  illustrates the launch of an operation to generate a list of directions. The mobile device  200  is executing a mapping application that graphically illustrates the current position  270  of the mobile device (and the traveler carrying the mobile device). The position is provided by the positioning capability of the mobile device  200 . The stage  201  also shows the user selecting an UI item  221  for launching a facility for computing routes. 
     At the second stage  202 , the selection of the UI item  221  has caused the mapping application to provide an interface to allow the user to enter a starting location at an UI item  223  and an ending location at an UI item  224 . The user is using the provided interface to enter an ending location for the route while letting the starting location to default to the current position of the mobile device. 
     At the third stage  203 , the user has completed entering the start and end locations of the route and is selecting a UI item  222 , which causes the mobile device  200  to compute one or more routes based on the start and end locations entered by the user. 
     At the fourth stage  204 , the mapping application has finished the route computation and provided three routes  231 - 233  that can take a traveler from the starting location to the end location. The mapping application in turn shows a map at a zoom level that allows all three routes  231 - 233  to be viewed in their entirety. The route  232  is the fastest of the three routes ( 25  minutes) and is selected by default. The route  232  appears highlighted, and its information is in a banner  240  near the top of the display. 
     The mapping application at this stage also provides several UI items for activating various map viewing options, such as an UI item  225  for centering the map at the current location, an UI item  226  for showing the map in 3D perspective, and an UI item  227  for displaying the route as a list (i.e., a list of directions). The fifth stage  205  shows the result of when the user selects the UI item  225  to center at the current location  270 . 
     The sixth stage  206  shows the result of when the user selects the UI item  227 , which brings up a list of directions  210  for the selected route  232 . The list of directions is represented by six UI items  211 - 216 . The item  211  provides the starting point of the route, which is also the current location  270  in this example. The items  212 - 216  correspond to maneuvers that the traveler should make according to the route  232 . The list of directions  210  may have additional maneuvers that are not being displayed, but can be brought into view by scrolling. 
     As mentioned, some embodiments dynamically display the list of directions such as  110  and  210  according to the current position of the mobile device. The display for the list of directions grays out (or makes less visible) an individual maneuver whenever the traveler carrying the mobile device has completed the maneuver and rendered that maneuver obsolete. Furthermore, some embodiments refresh the display of the list of directions whenever a certain number of displayed maneuvers have become obsolete.  FIG. 3  illustrates the correspondence between the dynamic display of the list of directions and the current position of the mobile device (i.e., the vehicle or the person carrying the mobile device).  FIG. 3  illustrates the list of directions  110  of  FIG. 1  in four stages  301 - 304 , which corresponds to stages  101 - 104  of  FIG. 1 . In addition,  FIG. 3  illustrates the current position of the mobile device in a two-dimensional (2D) map  300  for each of the four stages. In some embodiments, both the display for the list of directions  110  and the map  300  are available for view by the user of the mobile device  110 . Indicator  350  indicates the current position of the mobile device. 
     The map  300  includes several road sections  311 - 315 , some of which are referred to by items in the list of directions  110 . Specifically, the road section  312  correspond to “Hill Road” of the item  111 , the road section  313  corresponds to “Pack Road” of the item  112 , the road section  314  corresponds to “Lion Road” of the item  113 , the road section  315  corresponds to “Tiger Road” of the item  114 . The road sections  311 - 315  are also highlighted, indicating that they are part of the route computed by the mapping application for traveling from the starting location to the ending location. 
     At the first stage  301 , which corresponds to the stage  101 , the current position indicator  350  indicates that the traveler carrying the mobile device has performed the maneuver  111  and made the right turn onto Hill Road (the road section  312 ). The maneuver  111  is at this point obsolete and has been grayed out. 
     At the second stage  302 , which corresponds to the stage  102 , the current position indicator  350  indicates that the traveler has performed the maneuver  112  and taken the left turn onto Pack road (road section  313 ). The maneuver  112  is at this point also obsolete and grayed out. The dashed line in stage  102  indicates that the mobile device is in the process removing the two obsolete maneuvers from display, e.g., by scrolling the list of directions so items  111  and  112  come off the display. 
     At the third stage  303 , which corresponds to the stage  103  the display of the mobile device has completed the removal of the obsolete maneuver items  111 - 112  from display and added new items  115  and  116  from the list of directions  110 . The current position indicator  350  in the map indicates that the mobile device is still on Pack road and approaching Lion road but has yet to perform the maneuver  113  (left turn onto Lion Road). Accordingly, the item  113  has not been grayed-out. 
     At the fourth stage  304 , which corresponds to the stage  104 , the current position indicator  350  indicates that the traveler carrying the mobile device has performed the maneuver  113  and taken the left turn onto Lion Road (road section  314 ). The maneuver  113  is at this point obsolete and grayed out. The mobile device would remove the obsolete maneuver  113  later when, for example, the traveler carrying the mobile device has completed maneuver  114  and made the right turn into Tiger road. 
     In some embodiments, the dynamic updating of the list of directions is performed during navigation mode. Specifically, some embodiments dynamically update the list of directions as the mobile device is giving the traveler turn-by-turn instructions according to a route and in response to the current position of the mobile device. In some embodiments, the mobile device in its navigation mode instructs the driver/traveler to make a particular maneuver, and then changes the appearance of the corresponding maneuver item in the list of directions after the mobile device detects that the traveler carrying the mobile device has completed that particular maneuver.  FIG. 4  illustrates the dynamic display of the list of directions  110  during navigation operations by the mobile device  100 . 
       FIG. 4  illustrates the display of the mobile device  100  in four stages  401 - 404 .  FIG. 4  also illustrates the corresponding 2D map  400  in four stages  451 - 454 . The four map stages  451 - 454  shows the current positions of the mobile device during the stages  401 - 404 , respectively. The list of directions includes maneuvers  111 - 116  as in  FIGS. 1 and 3 . 
     The map  400  includes several road sections  411 - 415 , some of which are referred to by items in the list of directions  110 . Specifically, the road section  412  corresponds to “Hill Road” of the item  111 , the road section  413  corresponds to “Pack Road” of the item  112 , the road section  414  corresponds to “Lion Road” of the item  113 , and the road section  415  corresponds to “Tiger Road” of the item  114 . The road sections  411 - 415  are highlighted, indicating that they are part of the route computed by the mapping application for traveling from the starting location to the ending location. 
     The first stage  401  shows the mobile device  100  in 3D navigation mode. Specifically, the mobile device  100  is displaying a 3D view of the road from the perspective of the traveler based on his/her current position. Under the navigation mode, the mobile device is giving turn-by-turn instructions to the traveler based on a route that is used to generate the list of directions  110 . The mobile device is also displaying a notification  430  for the upcoming maneuver, i.e., making a left turn onto Pack Road in 0.2 miles. The current position indicator  450  in the corresponding map stage  451  indicates that the traveler carrying the mobile device is on Hill Road  412  and approaching Pack Road  413 . 
     The display of the mobile device  100  also provides several UI items such as UI items  421  and  422 . The UI item  421  is for bringing up the 3D navigation view (which is highlighted to indicate that the 3D navigation view is already selected as the current view). The UI item  422  is for bringing up a list of directions view. The first stage  401  shows the user selecting the UI item  422 . 
     The second stage  402  shows the mobile device  100  immediately after the user has selected the UI item  422 . The display of the mobile has switched to displaying the list of directions  110 . The mobile device is displaying maneuver items  111 - 114  from the list of directions  110 . The current position indicator  450  in the corresponding map stage  452  indicates that the traveler carrying the mobile device is on Hill Road  412  and traveling toward Pack Road  413 . The mobile device  100  in its navigation mode knows that the traveler carrying the mobile device has already taken the right turn onto Hill Road (i.e., maneuver  111 ) and that the left turn into Pack Road (i.e., maneuver  112 ) is coming up next. Consequently, maneuver item  111  is grayed-out but not maneuver item  112 . 
     The third stage  403  shows the mobile device  100  after the traveler carrying the mobile device has performed the maneuver of maneuver item  112 . The current position indicator  450  in the corresponding map stage  453  indicates that the traveler carrying the mobile device is on Pack Road  413  and traveling toward Lion Road  414 . The mobile device has grayed-out maneuver item  112 , because the traveler carrying the mobile device has already performed that maneuver by making the left turn onto Pack Road. Furthermore, the display of the mobile device is in the process of refreshing the display of the list of directions  110  (as indicated by the dashed line) by removing (or scrolling off) obsolete maneuver items  111  and  112  from the display. 
     The fourth stage  404  shows the mobile device  100  after it has completed the refreshing of the display of the list of directions. As illustrated, maneuver items  111  and  112  have disappeared from view (or scrolled-off), and new maneuver items  115  and  116  are brought into view (or scrolled-in). None of the items appear grayed-out, as the corresponding map stage  454  shows that the current position indicator  450  is approaching Lion Road but has yet to make the left turn (i.e., maneuver  113 ). 
       FIG. 4  illustrates an example in which the mobile device in navigation mode updates its display of the list of directions whenever the mobile device detects that the traveler carrying the mobile device has completed a maneuver that corresponds to an item in the list of directions. In some embodiments, the mobile device also changes the appearance of a particular maneuver item in the list of directions as the navigation software is instructing the traveler to perform that particular maneuver. 
       FIG. 5  conceptually illustrates a process  500  for dynamically updating a list of directions for some embodiments. In some embodiments, the process  500  starts after the mobile device has generated a list of directions or received a list of directions that is generated by another computing device. In some embodiments, the process  500  starts after the list of directions has become available and the mobile device has entered navigation mode. 
     The process receives (at  510 ) the position of the next maneuver in the list of directions and receives (at  520 ) the current position of the mobile device. In some embodiments, each maneuver is associated with a position that can be compared with the current position of the mobile device. In some embodiments, the current position is provided by GPS capabilities within the mobile device. Some embodiments identify the next maneuver in the list of directions as the first maneuver that the traveler carrying the mobile device will reach based on the mobile device&#39;s current position and direction. 
     Next, the process determines (at  530 ) whether the current position has reached the position of the maneuver. Some embodiments examine the received current position of the mobile device and compare it with the position that is associated with the next maneuver. In some embodiments, the process determines whether the current position of the mobile device is within a certain threshold range of the position of the next maneuver. If the current position of the mobile device indicates that the traveler carrying the mobile device has already reached or passed the position associated with the next maneuver, the process proceeds to  540 . If the current position of the mobile device indicates that the traveler carrying the mobile device has yet to reach the position of the maneuver, the process returns to  520  to receive the current position of the mobile device again. 
     At  540 , the process changes the appearance of the obsolete maneuver in the display. As the traveler carrying the mobile device is making his way through the route by performing the maneuvers suggested by the route, some embodiments mark each performed maneuver as having been completed and therefore obsolete. The process then changes the display of the list of directions to inform the user that the maneuver has already been performed. As discussed by reference to  FIGS. 1 and 3  above, some embodiments change the appearance of graphical items that are associated with obsolete maneuvers in the list of directions. Some embodiments change the appearance of those obsolete graphical item to make them less conspicuous than other items, such as by graying out. 
     The process then determines ( 550 ) if the destination has been reached. In some embodiments, the last maneuver in the list of directions corresponds to the arrival at the destination point of the route. In some embodiments, if the last maneuver in the list of directions has become obsolete, the process would realize that the mobile device has reached the destination. If the mobile device has not reached the destination, the process proceeds to  560 . If the mobile device has reached the destination, the process  500  ends. 
     The process determines (at  560 ) whether there are more than a threshold number of obsolete maneuvers in the display. As illustrated in  FIGS. 1 ,  3 , and  4 , the mobile device refreshes the display of the list of directions whenever two or more maneuver items in the display have been grayed out or marked as obsolete (so the threshold number of obsolete maneuvers is two in those examples). If the number of obsolete maneuver items being displayed is greater than or equal to the threshold number, the process proceeds to  570  to refresh the display in order to remove the obsolete maneuver items from display. Otherwise, the process  500  would not refresh the display and leave the obsolete maneuvers in the display until more maneuvers from the list of directions have been performed. 
     The process refreshes (at  570 ) the display of the list of directions such that at least some of the obsolete maneuvers are removed from display and additional maneuvers brought into view. Some embodiments animate the refresh by scrolling the list of directions. Some embodiments animate the refresh by fading-out obsolete items and fading-in new items from the list of directions. After refreshing the display of the list of directions, the process returns to  510 . 
     II. Distance Labels 
     Some embodiments provide a mapping or navigation application that intelligently places distance labels along a route in a map. A distance label placed at a particular position of the route shows the distance to the particular location from the starting point of the route. Distance labels allow the user of the map to quickly appreciate the distances between the various points of interest (e.g., maneuvers) along the route. In some embodiments that display the route as a list of driving directions, the distance labels are placed alongside the list of driving directions, and each distance label is associated with a maneuver in the list of directions. 
       FIG. 6  illustrates the placement of distance labels on a route in a map. The route includes a series of maneuvers that take a traveler from a point of origin to a point of destination, and the distance labels are for identifying the distances from the origin to some of those maneuvers along the route. 
     In some embodiments, the placement of distance labels is performed by a computing device running a mapping application when it computes the route. In some embodiments, the computing device is a mobile device that is being carried by the traveler and is capable of providing the traveler with dynamic information based on the current position of the mobile device. In some embodiments, the computing device is a device that is not being carried by the traveler, but nevertheless is running a mapping or navigation application that can compute and provide a route and/or a list of directions to the traveler. 
       FIG. 6  illustrates the placement of the distance labels in four stages  601 - 604 . Each stage shows a graphical user interface (GUI)  600  of a computing device. The GUI  600  is that of a mapping application, which is capable of providing several types of cartographic information, including a list of (driving) directions, maps in 2D view or 3D view, traffic conditions, as well as the current position of the mobile device. The GUI  600  includes an UI item  621  for bringing the current position of the mobile device into view, an UI item  622  for viewing the map in 3D perspective, an UI item  623  for providing traffic condition on the map, and an UI item  624  for creating a route from a starting location to an ending location. 
     At the first stage  601 , the mapping application of the computing device is showing a 2D map that is centered at the current location  670  of the traveler carrying the mobile device. For a mobile computing device that is being carried by the traveler, the current position is provided by positioning capabilities (e.g., GPS) of the mobile device in some embodiments. For a computing device that is not being carried by the traveler, the current position of the “traveler” can be the location of the computing device itself, or a current position of a traveler who sends his positional information to the computing device. The first stage  601  also shows the user (illustrated by a cursor) selecting the UI item  624  in order to activate an interface for entering the starting and ending locations for generating a route. 
     At the second stage  602 , the mapping application is displaying a route generation interface  630  for entering a start location and an ending location. The interface  630  was brought into the GUI  600  by the user&#39;s selection of the UI item  624 . The interface  630  allows the user to enter the starting location and ending location through items  631  and  632 . The interface  630  also has a UI item  633  for generating a route based on the entered starting and ending locations. The user in stage  602  is about to select the ending location item  632  for entering the ending location for the route while leaving the starting location to default to the current location. 
     At the third stage  603 , the user has finished entering the starting and ending locations of the route and is selecting the route generation item  633 . Selection of the route generation item  633  causes the mapping application to compute a route from the entered starting location to the entered ending location. The mapping application also generates a list of directions that provides instructions on what maneuvers to perform in order to reach the destination according to the computed route. 
     The fourth stage  604  shows the result of the route generation operation, in which the mapping application has generated a route  660  for reaching the destination location from the current position and a corresponding list of directions  610 . The GUI  600  at this stage shows a 2D map  641  at a zoom level that allows the route  660  to be viewed in its entirety. The GUI  600  also includes a pane  642  for displaying the generated list of directions  610 . The first item  611  in the list corresponds to the origin  670  of the route  660 . The last item in the list (not in the display) corresponds to the terminus  679  of the route  660 . 
     The 2D map  641  also displays four distance labels  671 - 674  along the route  660 . A distance label at a particular point in the route indicates the distance between the origin  670  of the route and that particular point in the route. For example, the number ‘2’ in the distance label  671  indicates that the label is associated with a point in the route that is 2 miles away from the origin  670 , while the number ‘40’ in the distance label  674  indicates that the distance label  674  is associated with a point in the route that is 40 miles away from the origin  670 . In some embodiments, the placement of the distance labels in the map is at scale with respect to the distance shown on the label. For example, the length along the route between the origin  670  and the label  673  corresponds to  26  miles according to the scale of the map. 
     One of ordinary skill would understand that distance labels can be in another unit of length such as kilometers, yards, etc. In some embodiments, a distance label at a particular point of the route displays an expected time of travel to reach that particular point based on predicted traveling speeds along the route. The distance labels in the examples described above are measurements from the start of the route. However, in some embodiments, distance labels are measurements from the end of route (i.e., distance until the destination or expected time of travel to reach the destination, etc.) 
     In addition to placing distance labels on the route in the map window  641 , some embodiments place distance labels along the list of directions as well. Specifically, some embodiments place distance labels in individual graphical items of the list of directions.  FIG. 7  illustrates distance labels that are placed along a list of directions and along a route in the map.  FIG. 7  illustrates the placement of the distance labels along the list of directions in three stages  701 - 703  of a GUI  700  of a computing device. 
     The first stage  701  is similar to the stage  603  of  FIG. 6 , in which the user has finished entering the starting and ending locations of the route and is selecting the route generation item  733 , which causes the mapping application to compute a route  760  and generating a list of directions  710  based on the computed route  760 . 
     The second stage  702  is similar to the stage  604  of  FIG. 6 , in which the GUI  700  displays a map window  741  and a pane  742 . The map window  741  shows the route  760  in its entirety and includes five distance labels  771 - 775  that are placed along the route  760 . The pane  742  is for showing the list of directions  710  and includes three of the same five distance labels  771 - 773  along the list of directions  710 . Since the pane  742  is configured to display only six maneuver items at a time, it can only display some of the distance labels. As illustrated, the pane  742  is displaying only items  711 - 716  of the list of directions, in which the distance label  771  (3 miles) is placed along the item  712 , the distance label  772  (5 miles) is displayed along the item  714 , and the distance label  773  (7 miles) is displayed along the item  715 . However, the GUI  700  allows the scrolling in the pane  742  so other maneuvers in the list of directions (and other distance labels) can be revealed. 
     The third stage  703  shows the GUI  700  after the user has scrolled the list of directions  710  in the pane  742  to reveal other maneuvers in the list of directions. As illustrated, the user has scrolled the list of directions up such that items  711 - 714  have been scrolled off the screen and the items  717 - 720  have been scrolled in. The distance label  774  (9 miles) associated with the maneuver item  718  and the distance label  775  (14 miles) associated with the maneuver item  720  are brought into view by the scrolling operation. 
     In some embodiments, placing a distance label next to a particular maneuver item in the list of directions means that the maneuver is to occur at or near the position specified by the distance label. For example, placing the label ‘3’ ( 771 ) next to the maneuver item  712  means that the maneuver “turn right onto H Street” is to occur at or near 3 miles from the origin of the route  760 . As mentioned, in some embodiments, each maneuver item represents a segment of the route between two consecutive maneuvers. In some of these embodiments, a distance label placed next to a maneuver item provides the information on the distance between the origin of the route and the segment of the route represented by the maneuver item. For example, in some embodiments, placing the distance label ‘5’ ( 772 ) next to the item  714  informs the user that some point in the segment of the route between the left turn onto 1st street (maneuver item  713 ) and the right turn on to Z street (maneuver item  714 ) is 5 miles away from the origin of the route. 
     In some embodiments, the mapping application places a predetermined number of distance labels on the route from the point of origin to the destination. In some embodiments, this predetermined number is independent of the length of the route. The example of  FIG. 6  has only 4 labels placed along the route  660  that is longer than 40 miles, while the example of  FIG. 7  has 5 labels placed along the route  760  that is only slightly longer than 14 miles. The choice of the number of labels is not contingent upon the distance of those routes. 
     The display of distance labels is useful for providing scale information to the user of the mapping application. A user seeing a route in the map with the distance labels would understand the scale of the map without having to consult the conventional linear scale for the map. Thus, some embodiments refer to the distance labels as distance scales. Furthermore, since a route is rarely if ever a straight line that can be easily compared with a straight scale, having distance labels allows the user to easily appreciate the actual distances between different points of interest in a not-so-straight route. 
     Different embodiments place distance labels along the route according to different criteria. In some embodiments, the distance labels are distributed uniformly distance wise throughout the entire route regardless of the positions or steps in the list of directions. Some embodiments place distance labels at positions along the route whose distance measures are multiples of a “nice round number” (such as 500 m, 1.5 km, 2.5 miles, etc.). In some embodiments, a “nice round number” is a number with at most two significant non-zero digits, and each of these two non-zero digits is 1, 2, or 5. This “nice round number” is a number that typically serves as the unit of a scale that runs along the bottom of the map. The distance labels therefore effectively turn the route into a map scale that has multiple segments, each segment representing a unit of the scale having a length that is the “nice round number”. (Of course, a conventional map scale is straight, while a “map scale” that is formed by distance labels along a route is one that can have turns and curves). 
     In some embodiments, this “nice round number”, (i.e., the length of a segment that is a unit of the scale) is referred to as a “segment unit value”. A segment unit value provides a distance value that the segment represents on the map. For example, in a metric system, a segment unit value may be 5 meters, 10 meters, 100 meters, 1 km, 5 km, etc. In a U.S. customary system, a segment unit value maybe 1 feet, 5 feet, 100 feet, 1000 feet, 1 mile, 5 miles, 10 miles, etc. 
     In order to determine the placement of distance labels, some embodiments determine other parameters based on the segment unit value. Some embodiments compute a segment display length, which is the length of the segment as displayed on the screen of the device (e.g., between 0.5-2.0 cm on the screen). This length is determined from the segment unit length based on the scale of the map at the current zoom level. Some embodiments compute a number of segments, which determines the number of distance labels to display along the route. In some embodiments, the mapping application may divide the route up to five segments (i.e., having up to four distance labels) regardless of the actual length of the route. 
       FIG. 8  conceptually illustrates a process  800  of some embodiments for determining the placement of the distance labels along a route. In some embodiments, a mapping application that displays the distance labels performs the process  800  (e.g., the mapping application described above by reference to  FIGS. 6-7 ). In some embodiments, the process  800  starts whenever the mapping application has computed a route with a list of directions. In some embodiments, the process  800  starts whenever the zoom level of the map changes. 
     The process  800  starts by receiving (at  805 ) the length of the route. The length of the route is computed from the coordinates of various elements of the route in some embodiments. In some embodiments, the placement of the distance labels is based on the total length of the route, and the received length of route is the total length of the route, regardless of zoom level. In some embodiments, the placement of the distance labels is based on the portion of the route being displayed under the current zoom level, and the received length of the route is the length of the route being displayed currently. 
     The process then computes (at  810 ) the segment unit value, and computes (at  820 ) the number of distance labels to display along the route. Some embodiments adjust the segment unit value based on the received length of the route in order to limit the number of distance labels to a target number (e.g., to four distance labels/five segments). In some embodiments, the segment unit value is computed in order to achieve a target number of distance labels, each distance label having a distance measure that is a multiple of a “nice round number”. The computation of the number of distance labels as well as segment unit value will be further described below by reference to  FIG. 9 . 
     Next, the process  800  computes (at  830 ) the segment display length for the particular zoom level that accurately represents the distance of the computed segment unit value on the map. As mentioned, the segment display length is the length of the segment as displayed on the screen of the device. In order to compute the segment display length, the process  800  determines the distance that is represented by a particular unit (e.g., 1 cm, 2 cm, etc.) on the display of the device. The process  800  then calculates the segment display length in order to provide a length that represents the segment unit value that was calculated for the particular zoom level. For example, if 1 cm distance on the screen represents 1.2 miles at the current zoom level, the segment display length of a segment having a segment unit value of 1 mile would be approximately 0.833 cm on the screen of the device. 
     After determining the placement of the distance labels along the route in the map, the process displays (at  840 ) the distance labels along the route according to the computed number of distance labels and segment display length. The process then displays (at  850 ) the distance labels in the list of directions by associating each distance label to a nearest (distance wise) maneuver or step in the list of directions. In some embodiments, if multiple distance labels are associated with a particular maneuver in the list of directions (e.g., when the particular maneuver represents a long stretch of the highway without turns), the mapping application would display only one distance label for that maneuver. After displaying the distance labels, the process  800  ends. 
     As mentioned, the number of distance labels and the segment unit value are contingent upon computing a nice round number that is suitable to serve as the segment unit value.  FIG. 9  illustrates a process  900  for computing a desirable segment unit value as well as a suitable number of segments for the placement of distance labels along the route. 
     The process  900  initially identifies (at  905 ) a lower bound value L of the segment unit value based on a target number of distance labels. Some embodiments compute this lower bound number by dividing the length of the route by the target number of segments corresponding to the target number of distance labels. For example, as mentioned, some embodiments limit the number of distance labels to up to 4 (thus the target number of segments is 5). Thus, for a route that is 7995 meters long, the process would divide the route length by 5 and produce a lower bound number 1599 meters. This value is typically not a desirable number and thus the process will re-adjust the segment unit value according to a new desirable number value that gets computed (at the end of process) for the segment (e.g., 1000 meters, 1 km, 5 km, etc.). 
     The process  900  then selects (at  910 ) a unit for the distance labels. For example, in a metric system, the process determines whether to display the scale in meters or kilometers. In a U.S. customary system, the process would determine whether to display the scale in feet or miles. Continuing with the example, the process may determine to display the 1599 meters in units of “kilometers” with 1 km=1000 meters. In some embodiments, the process may also analyze the locale of the region of the map to determine an appropriate unit measurement. For instance, if the mapping application is in use in Europe, the mapping application may apply the metric system, whereas a device in the U.S. may apply the U.S. standard system. 
     The process then computes (at  915 ) a log of the lower bound L (e.g., log(L)) in the chosen units of the lower bound to obtain a number X. The number X includes an integer portion I and a fractional portion f. In some embodiments, the log may be a base 10 logarithm. In other embodiments, a different base may be used (e.g., 2 or the natural log, etc.). Continuing with the example, computing log (1599 meters*1 km/1000 meters=1.599 km)=(approx.) 0.2038484637. Thus the integer portion I=0 and the fractional portion f=(approx.) 0.203. 
     The process then selects (at  920 ) a desirable number based on the log of the lower bound L. Some embodiments compare the fractional portion f of the log of L to a set of numbers N and selects the smallest number N′ that is larger than f from the set N. The set of numbers N are computed as the log of a set of desirable numbers n. For example, the set of desirable values n could be 1.25, 2.5, 5 or 10, and the set of numbers N would then be {log(1.25), log(2.5), log(5), log(10)}, which equals approximately {0.0969, 0.3979, 0.6989, and 1}. Continuing with the example, the value of log(2.5)=0.3979 is the smallest number of the set N that is larger than the fractional portion f=(0.203). Thus, the process selects for N′ the value of log(2.5), whose corresponding desirable number n′ from the set n is 2.5. 
     The process then computes (at  925 ) the segment unit value by using the selected desirable number. In some embodiments, the process computes 10 (I+N′)  or 10 I *n′ to obtain the segment unit value for a segment. Following the above example, where the lower bound value L is 1599 meters and I=0 and n′=2.5 (selected by fractional portion f=0.203), the scale segment would have a segment unit value of 2.5 km per segment, and the desired scale with a unit of measurement in kilometers. 
     Having computed the segment unit value of a segment for the scale, the process  900  then determines (at  930 ) the number of segments to display in the scale based on length of the route and the segment unit value. In some embodiments, the process  900  determines the number of segments to display along the route by using the following series of computations. 
     The process  900  first determines how many segments at segment unit value will fit into the length of the route. The process  900  then determines whether the number of segments that will fit into the length of route is less than or greater than 4.5 segments (since the target number of segments is five). The process  900  then rounds the number to the nearest integer number, such that a number of segments less than 4.5 segments rounds to 4 and a number of segments greater than (or equal to) 4.5 rounds to 5. For example, if the mapping application determines that 4.4 segments fit within the length of the route, the application rounds the 4.4 segments down and only displays 3 distance labels (i.e., 4 segments) along the route on the map. If the mapping application determines that 4.8 segments fit within the length of the route, the process rounds the 4.8 segments up and displays 4 distance labels (i.e., 5 segments) along the route on the map. 
     In some embodiments, the distance labels are placed such that a section of a route with more maneuvers is more likely to have a distance label, while a section of the route with fewer maneuvers is less likely to have a distance label. Placing distance labels in such a fashion allows a traveler to quickly realize whether he is in a section of the route with a lot of maneuvers, or if he is in a section of the route with very few maneuvers. For example, most routes have many maneuvers near the start and the destination but relatively few maneuvers in between. Some embodiments therefore place more distance labels near the start and end of the route where there are many maneuvers, and fewer distance labels in the middle stretch where there are fewer maneuvers. 
     For some embodiments,  FIG. 10  illustrates the placement of distance labels based on where the maneuvers are in the route.  FIG. 10  illustrates a GUI  1000  of a computing device running a mapping application that is similar to the GUI  700  of  FIG. 7 . Like the GUI  700 , the GUI  1000  also has a 2D map window  1041  for displaying a route  1060  and a pane  1042  for displaying a list of directions  1010 . The mapping application has already computed the route  1060  from a point of origin  1070  to a destination  1079 . The mapping application has also generated the list of directions  1010  based on the computed route  1060 . 
     As illustrated, the mapping application has placed distance labels  1071 - 1074  along the route  1060 . Toward the origin of the route lie the distance labels  1071  (1 mile) and  1072  (2 mile), as there are many turns near the origin (as can be seen by the maneuver items  1011 - 1018  near the start of the list of directions  1010 ). Likewise, toward the end of the route lie the distance labels  1073  (49 miles) and  1074  (50 miles), as there are many turns/maneuvers near the destination. 
     Some embodiments decide whether to place one of the fixed number of distance labels (e.g., 4) at any particular position along the route by determining how many maneuvers or steps are near that particular position. In some embodiments, the placement of the distance labels along a particular section of the route is determined by the number of maneuvers or steps within that section of the route. In other words, some embodiments distribute the distance labels based on the “density” of maneuvers along the route. 
     Some embodiments determine the placement of the distance labels along the route from the list of directions. The mapping application in some of these embodiments distributes the distance labels as evenly as possible among the maneuver items in the list regardless of the actual distances associated with the maneuvers. In some embodiments, the distribution of the distance labels is based on making the number of maneuvers between consecutive distance labels as even as possible. For example, some embodiments associate distance labels  1071 - 1074  with individual maneuvers in the list of directions  1010  so as to make the number of maneuvers between the distance labels  1071  and  1072  the same or nearly the same as the number of maneuvers between the distance labels  1072  and  1073 , and the number of maneuvers between the distance labels  1072  and  1073  the same or nearly the same as the number of maneuvers between the distance labels  1073  and  1074 , etc. Once the distance labels have been associated with individual maneuvers in the list of directions, the distance labels are introduced back to the route in the map based on the positions of the associated maneuvers. 
     Thus, a segment of the route between two consecutive maneuvers that are far apart in actual distance would not receive more distance labels than a segment of the route between two consecutive maneuvers that are close together in actual distance. For example, the segment associated with maneuver  1019 , which is 46.9 miles long, would not have more distance labels than say, the segment associated with maneuver  1014 , which is only 0.5 miles long. In such a manner, a short stretch of the route having more maneuvers would have more distance labels than a long stretch of the route with fewer maneuvers. 
     In some embodiments, the mapping application outputs the list of directions to a printing device. In some of these embodiments, the distance labels are included in the printed list and placed next to some of the printed maneuver items.  FIG. 11  illustrates a printed list of directions that includes distance labels. 
       FIG. 11  illustrates a GUI  1100  of a computing device running a mapping application that is similar to the GUI  700  of  FIG. 7 . Like the GUI  700 , the GUI  1100  also has a 2D map window  1141  for displaying a route  1160  and a pane  1142  for displaying a list of directions  1110 . The mapping application has already computed the route  1160  from a point of origin  1170  to a destination  1179 . The mapping application has also generated the list of directions  1110  based on the computed route  1160 . 
     The mapping application has placed 5 distance labels  1171 - 1175  along the route  1160  in the map window  1141  as well as along the list of directions  1110  in the pane  1142 . The pane  1142  is configured to display at most seven maneuvers from the list of directions. As a result, only a subset of the list of directions is displayed, and only the distance labels associated with the displayed maneuvers are displayed in the pane  1142  (i.e., only  1171 - 1173 ). 
       FIG. 11  also illustrates the print out of the list of directions by the user (through the use of menu items at the top of the GUI  1100 ). The printing operation produced a print-out  1105 , which includes the complete list of the directions  1110  and all of the distance labels  1171 - 1175 . 
     In the example of  FIG. 11 , the set of distance labels being displayed along the route in the map window  1141 , along the list of directions in the pane  1142 , and in the print out  1105  are the same. However, in some embodiments, the set of distance labels in the map is not necessarily the same as the set of distance labels in the list of directions, and the set of distance labels in the print out is not necessarily the same as either the map or the list of directions.  FIG. 12  illustrates a mapping application in which the distance labels along the route in the map window, along the list of directions, and in the print out are not the same.  FIG. 12  illustrates a route  1260  in a map window  1241 , a list of directions  1210  in a pane  1242 , and a print-out  1205  of the list of directions  1210 . The set of distance labels in the print out  1205  includes distance labels  1271  (3 mile),  1272  (5 mile),  1273  (7 mile),  1274  (9 mile), and  1275  (14 mile). The map window  1241 , however, displays only distance label  1271  (3 mile),  1273  (7 mile), and  1275  (14 mile). The pane  1242  displays only a portion of the list of directions  1210 , and hence displays only some of the distance labels ( 1271 - 1273 ), though the user can scroll the list of directions  1210  to view the rest ( 1274 - 1275 ). 
     Some embodiments do not display distance labels along the route in the map or along the list of directions.  FIG. 13  illustrates a GUI  1300  of a mapping application that displays distance labels  1371 - 1373  only along the list of directions  1310  in pane  1342  but not along the route  1360  in the map  1341 . The distance labels  1371 - 1375  are printed along with the list of directions  1310  in the print-out  1305 .  FIG. 14  illustrates a mapping application that does not display distance labels at all in the GUI  1410  (not along the route  1460  in the map  1441  nor along the list of directions  1410  in pane  1442 ). The distance labels  1471 - 1475  are available only in the print-out  1405  of the list of directions  1410 .  FIG. 15  illustrates a mapping application that displays the distance labels  1571 - 1575  along the route  1560  in a map window  1541  of a GUI  1500  and includes the distance labels  1571 - 1575  in a print-out  1505  of a list of directions  1510 . The mapping application, however, does not display the distance labels along the list of directions  1510  in the pane  1542  within the GUI  1500 . 
     III. Changing the View of the Map by Selecting a Step in the List of Directions 
     In some embodiments, individual steps or maneuvers in the list of directions are selectable items in the GUI. The selection of a GUI item that corresponds to a particular maneuver in the list of directions causes the view of the map to move toward a location on the route that corresponds to the particular maneuver. When the user selects a new maneuver from the list of directions, some embodiments animate a transition from a previous view for a previously selected maneuver to a new view for the newly selected maneuver. In some embodiments, the transition includes zooming out to temporarily include both the previously selected maneuver and the newly selected maneuver before zooming in at the newly selected maneuver or step. 
       FIG. 16  illustrates a mapping application that changes the view of the map due to the selection of a maneuver from a list of directions.  FIG. 16  illustrates a GUI  1600  of a computing device running the mapping application. Like the GUI  700  of  FIG. 7 , the GUI  1600  has a 2D map window  1641  for displaying a route  1660  and a pane  1642  for displaying a list of directions  1610 . The mapping application has already computed the route  1660  from a point of origin  1670  to a destination (not shown). The mapping application has also generated the list of directions  1610  based on the computed route  1660 . The mapping application has also generated distance labels  1671 - 1673 , which are displayed along the route  1660  in the map window  1641  as well as along the list of directions in the pane  1642 . 
     In four stages  1601 - 1604  of the GUI  1600 ,  FIG. 16  illustrates changing the view of the map due to the selection of a maneuver items in the list of directions  1610 . At the first stage  1601 , the map window  1641  is centered on the point of origin  1670 , which is also the current position of the mobile device. Since this is the point that is the currently the center of the map view of the mapping application, this is also the currently viewed position. The user is selecting an item  1615  in the list of directions  1610 . The item  1615  corresponds to a maneuver that is not in the map window  1641  during stage  1601 . Furthermore, positions along the route  1660  that correspond to distance labels  1671 ,  1672 , and  1673  are not in map window  1641 . 
     At the second stage  1602 , the mapping application begins to change the view of the map by zooming out. The zooming out allows the map window  1641  to show positions along the route  1660  that correspond to distance labels  1671  (1 mile) and  1672  (2 mile). The original position  1670  is also being kept in view. However, the distance label  1673  (9 mile) (which is associated with the selected maneuver  1615 ) is still out of the view. 
     At the third stage  1603 , the mapping application continues to zoom out until the original position  1670  and the selected maneuver  1615  (which corresponds to distance label  1673 ) are both in view of the map  1641 . 
     Finally, at the fourth stage  1604 , the mapping application zooms in on the position of the maneuver  1615  (and of the distance label  1673 ). The original location  1670  and distance labels  1671  and  1672  that were visible during stages  1602  and  1603  are no longer in view. In some embodiments, the new zoom level is based on the distance between the selected maneuver and its immediate neighboring maneuvers. 
     Some embodiments animate the transition between the different views of the map upon the selection of a maneuver item in the list of directions. In some embodiments, the animated transition can be based upon the movement of a virtual camera above the map.  FIG. 17  conceptually illustrates the transition between different views of the map in  FIG. 16  based on the movement of such a virtual camera. One of ordinary skill would understand that the introduction of the virtual camera is for conceptually explaining the movement of the view of the map. Some embodiments do not actually implement such a virtual camera. 
       FIG. 17  illustrates the movement of the virtual camera in four stages  1701 - 1704 . Each stage illustrates a map view that is seen in the map window  1641  in the four stages  1601 - 1604  of  FIG. 16 . Each stage also illustrates a virtual camera  1750  hovering conceptually above a map surface  1730  that includes the entirety of the route  1660 . 
     The first stage  1701  shows a map view  1711  that is seen in the map window  1641  during the stage  1601 , which encompasses only the point of origin  1670 . The stage shows the camera  1750  at a height over the map surface  1730  that corresponds to the zoom level of the map view  1711 , as the camera is viewing a portion of the map surface  1730  that corresponds to the map view  1711 . 
     The second stage  1702  shows a map view  1712  that is seen in the map window  1641  during the stage  1602 , which encompasses the point of origin  1670  as well as distance labels  1671  and  1672 . The stage shows the camera  1750  moving to a height over the map surface  1730  that corresponds to the zoom level of the map view  1712 , as the camera is viewing a portion of the map surface  1730  that corresponds to the map view  1712 . 
     The third stage  1703  shows a map view  1713  that is seen in the map window  1641  during the stage  1603 , which encompasses the point of origin  1670 , the distance labels  1671  and  1672 , as well as the selected maneuver at distance label  1673 . The stage shows the camera  1750  moving even higher to a height that corresponds to the zoom level of the map view  1713 , as the camera is viewing a portion of the map surface  1730  that corresponds to the map view  1713 . 
     The fourth stage  1704  shows a map view  1714  that is seen in the map window  1641  during the stage  1604 , which encompasses only the selected maneuver at distance label  1673 , but not the original point  1670  as well as the other distance labels  1671  and  1672 . The stage shows the camera  1750  moving lower to a height that corresponds to the zoom level of the map view  1714 , as the camera is viewing a portion of the map surface  1730  that corresponds to the map view  1714 . 
     The change of map view applies equally even when the original position and the position of the selected maneuver are far apart, such as when the original position is at the starting point of the route and the selected maneuver is at the destination of the route.  FIG. 18  illustrates changing the view of the map due to the selection of a maneuver item that is far away from the original position.  FIG. 18  shows the GUI  1600  of the computing device of the  FIG. 16 . As in  FIG. 16 , the mapping application has already generated the route  1660  and a corresponding list of directions  1610  for traveling to a destination point  1679 . The mapping application has also generated distance labels  1671 - 1675 , which are displayed along the route  1660  in the map window  1641  as well as along the list of directions in the pane  1642 . 
       FIG. 18  shows the change in map view to a far-away maneuver in four stages  1801 - 1804 . At the first stage  1801 , the map window  1641  is centered on the point of origin  1670 , which is also the current position of the mobile device. The user is selecting an item  1617  in the list of directions  1610 . The item  1617  is associated with the distance label  1675  (22 miles). The item  1617  corresponds to a maneuver that is far away from the current position  1670  and not in the map window  1641  during the stage  1801 . Furthermore, positions along the route  1660  that correspond to distance labels  1671 - 1675  are not in map window  1641 . 
     At the second stage  1802 , the mapping application begins to change the view of the map by zooming out. The zooming out allows the map window  1641  to show positions along the route  1660  that correspond to distance labels  1671  (1 mile) and  1672  (2 miles). The original position  1670  is also being kept in view. However, the distance label  1673  (9 miles), the distance label  1674  (21 miles), and distance label  1675  (22 miles) (which is associated with the selected maneuver  1617 ) are still out of the view. 
     At the third stage  1803 , the mapping application continues to zoom out until both the original position  1670  and the selected maneuver  1617  (which correspond to distance label  1675  and is near the destination point  1679 ) are both in view of the map  1641 . Because the selected maneuver is very close to the destination point  1679 , the view of the map  1641  in fact encompasses the entire route  1660 . 
     Finally, at the fourth stage  1804 , the mapping application zooms in on the position of the maneuver  1617  (and of the distance label  1675 ). The original location  1670  and distance labels  1671 - 1674  that were visible during stage  1803  are no longer in view. 
       FIG. 19  conceptually illustrates the transition between the different views of the map in  FIG. 18  based on the movement of a virtual camera  1950 .  FIG. 19  illustrates the movement of the virtual camera in four stages  1901 - 1904 . Each stage illustrates a map view that is seen in the map window  1641  in the four stages  1801 - 1804  of  FIG. 18 . Each stage also illustrates the virtual camera  1950  hovering conceptually above a map surface  1930  that includes the entirety of the route  1660 . 
     The first stage  1901  shows a map view  1911  that is seen in the map window  1641  during the stage  1801 , which encompasses only the point of origin  1670 . The stage shows the camera  1950  at a height over the map surface  1930  that corresponds to the zoom level of the map view  1911 , as the camera is viewing a portion of the map surface  1930  that corresponds to the map view  1911 . 
     The second stage  1902  shows a map view  1912  that is seen in the map window  1641  during the stage  1802 , which encompasses the point of origin  1670  as well as distance labels  1671  and  1672 . The stage shows the camera  1950  moving to a height over the map surface  1930  that corresponds to the zoom level of the map view  1912 , as the camera is viewing a portion of the map surface  1930  that corresponds to the map view  1912 . 
     The third stage  1903  shows a map view  1913  that is seen in the map window  1641  during the stage  1803 , which encompasses the point of origin  1670 , the distance labels  1671 - 1674 , as well as the selected maneuver  1617  at distance label  1675 . The stage  1903  shows the camera  1950  moving even higher to a height that corresponds to the zoom level of the map view  1913 . Because the selected maneuver is very close to the destination point  1679 , the map view  1913  in fact encompasses the entire route  1660 . As a result, the camera  1950  is viewing the entirety of the map surface  1930 . 
     The fourth stage  1904  shows a map view  1914  that is seen in the map window  1641  during the stage  1804 , which encompasses only the selected maneuver at distance label  1675 , but not the original point  1670 , nor the other distance labels  1671 - 1674 . The stage shows the camera  1950  moving lower to a height that corresponds to the zoom level of the map view  1914 , as the camera is viewing a portion of the map surface  1930  that corresponds to the map view  1914 . 
     In some embodiments, if the selected maneuver from the list of directions is sufficiently close to the current position being viewed, the selection of the maneuver would cause the view of the map to pan to the position of the selected maneuver but not zoom out. In some embodiments, this occurs when the current position and the new position of the selected maneuver can both be brought into view at the current zoom level.  FIG. 20  illustrates changing the view of the map due to the selection of a maneuver item that is near the original view.  FIG. 20  shows the GUI  1600  of the computing device of  FIG. 16 . As in  FIG. 16 , the mapping application has already generated the route  1660  and a corresponding list of directions  1610  for traveling to a destination point  1679 . The mapping application has also generated distance labels  1671 - 1675 , which are displayed along the route  1660  in the map window  1641  as well as along the list of directions in the pane  1642 . 
       FIG. 20  shows the change in map view to a nearby maneuver in four stages  2001 - 2004 . At the first stage  2001 , the map window  1641  is centered on the point of origin  1670 , which is also the current position of the mobile device. The user is selecting an item  1611  in the list of directions  1610 , which is associated with distance label  1671  (1 mile). The item  1611  corresponds to a maneuver that is close to the current position  1670  but not yet in view of the map window  1641 . 
     At the second stage  2002 , the mapping application begins to change the view of the map by panning toward the position that corresponds to maneuver item  1611 . As illustrated, by panning alone without zooming out, the map window  1641  is able to bring the selected maneuver item  1611  (which is associated with distance label  1671 ) into view while still keeping the original position  1670  in view. 
     At the third stage  2003 , the mapping application continues to pan toward the selected maneuver  1611  (i.e., distance label  1671 ). The original position  1670  is gradually shifted out of view of the map window  1641 . However, the map window  1641  is still at the same zoom level. 
     Finally, at the fourth stage  2004 , the view of the map is centered at the position of the selected maneuver  1611  (and of the distance label  1671 ). The original location  1670  is no longer in view. 
       FIG. 21  conceptually illustrates the transition between the different views of the map in  FIG. 20  based on the movement of a virtual camera  2150 .  FIG. 21  illustrates the movement of the virtual camera in four stages  2101 - 2104 . Each stage illustrates a map view that is seen in the map window  1641  in the four stages  2001 - 2004  of  FIG. 20 . Each stage also illustrates the virtual camera  2150  hovering conceptually above a map surface  2130  that includes the entirety of the route  1660 . 
     The first stage  2101  shows a map view  2111  that is seen in the map window  1641  during the stage  2001 , which encompasses only the point of origin  1670 . The stage shows the camera  2150  at a height over the map surface  2130  that corresponds to the zoom level of the map view  2111 , as the camera is viewing a portion of the map surface  2130  that corresponds to the map view  2111 . 
     The second stage  2102  shows a map view  2112  that is seen in the map window  1641  during the stage  2002 , which encompasses the point of origin  1670  as well as the distance labels  1671 . The stage shows the camera  2150  remaining at the same height as it was in stage  2101 . It is moving laterally as it pans toward the selected maneuver. 
     The third stage  2103  shows a map view  2113  that is seen in the map window  1641  during the stage  2003 . The camera  2150  continues its lateral movement toward the selected maneuver (at distance label  1671 ) and slowly panning away from the origin position  1670 . 
     The fourth stage  2104  shows a map view  2114  that is seen in the map window  1641  during the stage  2004 , which encompasses only the selected maneuver at distance label  1671 , but not the original point  1670 . The camera  2150  has completed its lateral movement to be above the selected maneuver, but it remains at the same height as it was in stage  2101  without change in zoom level. 
     Though not illustrated, once a mapping application has completed the view changing operation to the selected maneuver from the list of directions, the user can select another maneuver from the list of directions, and the mapping application would perform the same view changing operation toward the newly selected maneuver by treating the originally selected maneuver as the currently viewed position. Though each of the selected maneuvers in the examples of  FIGS. 16-21  is associated with a distance label, some embodiments perform the same view changing operation regardless of whether the selected maneuver is associated with a distance label. 
     For some embodiments,  FIG. 22  conceptually illustrates a process  2200  for transitioning the view of the map when a maneuver in the list of directions is selected. In some embodiments, the process  2200  is performed by a computing device when running a mapping application as described by reference to  FIGS. 16-21 . The process starts after a route has been computed and a list of directions based on the computed route has been generated, and the mapping application has provided a map and is viewing the map at a currently viewed position. This currently viewed position could be the current position of a traveler, a previously selected maneuver, or another position specified by the user to the mapping application. 
     The process  2200  receives (at  2210 ) the position of the selected maneuver. Based on the received position, the process determines (at  2220 ) whether the selected maneuver is near the currently viewed position. In some embodiments, a selected maneuver is determined to be “near” the currently viewed position if both the selected maneuver and the currently viewed position can fit into the map view at the current zoom level. If the selected maneuver is near the currently viewed position, the process proceeds to  2230 . Otherwise the process proceeds to  2240 . 
     At  2230 , the process changes the view of the map toward the selected maneuver by performing a panning operation without changing the zoom level of the map. An example of such a panning operation is described above by reference to  FIGS. 20-21 . After performing the panning operation, the process proceeds to  2260 . 
     At  2240 , the process changes the view of the map by zooming out until both the currently viewed position and the selected maneuver are both in view. The process then zooms ( 2250 ) in toward the selected maneuver at a zoom level that is appropriate for the selected maneuver. The change of zoom level is described above by reference to  FIGS. 16-19 . 
     At  2260 , the process determines whether another maneuver is selected from the list of directions. If so, the process makes (at  2270 ) the position of the selected maneuver the currently viewed position and returns to  2210 . Otherwise, the process  2200  ends. 
     IV. Electronic Systems 
     Many of the above-described features and applications are implemented as software processes that are specified as a set of instructions recorded on a computer readable storage medium (also referred to as computer readable medium). When these instructions are executed by one or more computational or processing unit(s) (e.g., one or more processors, cores of processors, or other processing units), they cause the processing unit(s) to perform the actions indicated in the instructions. Examples of computer readable media include, but are not limited to, CD-ROMs, flash drives, random access memory (RAM) chips, hard drives, erasable programmable read-only memories (EPROMs), electrically erasable programmable read-only memories (EEPROMs), etc. The computer readable media does not include carrier waves and electronic signals passing wirelessly or over wired connections. 
     In this specification, the term “software” is meant to include firmware residing in read-only memory or applications stored in magnetic storage which can be read into memory for processing by a processor. Also, in some embodiments, multiple software inventions can be implemented as sub-parts of a larger program while remaining distinct software inventions. In some embodiments, multiple software inventions can also be implemented as separate programs. Finally, any combination of separate programs that together implement a software invention described here is within the scope of the invention. In some embodiments, the software programs, when installed to operate on one or more electronic systems, define one or more specific machine implementations that execute and perform the operations of the software programs. 
     A. Mobile Device 
     The mapping and navigation applications of some embodiments operate on mobile devices, such as smart phones (e.g., iPhones®) and tablets (e.g., iPads®).  FIG. 23  is an example of an architecture  2300  of such a mobile computing device. Examples of mobile computing devices include smartphones, tablets, laptops, etc. As shown, the mobile computing device  2300  includes one or more processing units  2305 , a memory interface  2310  and a peripherals interface  2315 . 
     The peripherals interface  2315  is coupled to various sensors and subsystems, including a camera subsystem  2320 , a wireless communication subsystem(s)  2325 , an audio subsystem  2330 , an I/O subsystem  2335 , etc. The peripherals interface  2315  enables communication between the processing units  2305  and various peripherals. For example, an orientation sensor  2345  (e.g., a gyroscope) and an acceleration sensor  2350  (e.g., an accelerometer) is coupled to the peripherals interface  2315  to facilitate orientation and acceleration functions. 
     The camera subsystem  2320  is coupled to one or more optical sensors  2340  (e.g., a charged coupled device (CCD) optical sensor, a complementary metal-oxide-semiconductor (CMOS) optical sensor, etc.). The camera subsystem  2320  coupled with the optical sensors  2340  facilitates camera functions, such as image and/or video data capturing. The wireless communication subsystem  2325  serves to facilitate communication functions. In some embodiments, the wireless communication subsystem  2325  includes radio frequency receivers and transmitters, and optical receivers and transmitters (not shown in  FIG. 23 ). These receivers and transmitters of some embodiments are implemented to operate over one or more communication networks such as a GSM network, a Wi-Fi network, a Bluetooth network, etc. The audio subsystem  2330  is coupled to a speaker to output audio (e.g., to output voice navigation instructions). Additionally, the audio subsystem  2330  is coupled to a microphone to facilitate voice-enabled functions, such as voice recognition (e.g., for searching), digital recording, etc. 
     The I/O subsystem  2335  involves the transfer between input/output peripheral devices, such as a display, a touch screen, etc., and the data bus of the processing units  2305  through the peripherals interface  2315 . The I/O subsystem  2335  includes a touch-screen controller  2355  and other input controllers  2360  to facilitate the transfer between input/output peripheral devices and the data bus of the processing units  2305 . As shown, the touch-screen controller  2355  is coupled to a touch screen  2365 . The touch-screen controller  2355  detects contact and movement on the touch screen  2365  using any of multiple touch sensitivity technologies. The other input controllers  2360  are coupled to other input/control devices, such as one or more buttons. Some embodiments include a near-touch sensitive screen and a corresponding controller that can detect near-touch interactions instead of or in addition to touch interactions. 
     The memory interface  2310  is coupled to memory  2370 . In some embodiments, the memory  2370  includes volatile memory (e.g., high-speed random access memory), non-volatile memory (e.g., flash memory), a combination of volatile and non-volatile memory, and/or any other type of memory. As illustrated in  FIG. 23 , the memory  2370  stores an operating system (OS)  2372 . The OS  2372  includes instructions for handling basic system services and for performing hardware dependent tasks. 
     The memory  2370  also includes communication instructions  2374  to facilitate communicating with one or more additional devices; graphical user interface instructions  2376  to facilitate graphic user interface processing; image processing instructions  2378  to facilitate image-related processing and functions; input processing instructions  2380  to facilitate input-related (e.g., touch input) processes and functions; audio processing instructions  2382  to facilitate audio-related processes and functions; and camera instructions  2384  to facilitate camera-related processes and functions. The instructions described above are merely exemplary and the memory  2370  includes additional and/or other instructions in some embodiments. For instance, the memory for a smartphone may include phone instructions to facilitate phone-related processes and functions. Additionally, the memory may include instructions for a mapping and navigation application as well as other applications. The above-identified instructions need not be implemented as separate software programs or modules. Various functions of the mobile computing device can be implemented in hardware and/or in software, including in one or more signal processing and/or application specific integrated circuits. 
     While the components illustrated in  FIG. 23  are shown as separate components, one of ordinary skill in the art will recognize that two or more components may be integrated into one or more integrated circuits. In addition, two or more components may be coupled together by one or more communication buses or signal lines. Also, while many of the functions have been described as being performed by one component, one of ordinary skill in the art will realize that the functions described with respect to  FIG. 23  may be split into two or more integrated circuits. 
     B. Computer System 
       FIG. 24  conceptually illustrates another example of an electronic system  2400  with which some embodiments of the invention are implemented. The electronic system  2400  may be a computer (e.g., a desktop computer, personal computer, tablet computer, etc.), phone, PDA, or any other sort of electronic or computing device. Such an electronic system includes various types of computer readable media and interfaces for various other types of computer readable media. Electronic system  2400  includes a bus  2405 , processing unit(s)  2410 , a graphics processing unit (GPU)  2415 , a system memory  2420 , a network  2425 , a read-only memory  2430 , a permanent storage device  2435 , input devices  2440 , and output devices  2445 . 
     The bus  2405  collectively represents all system, peripheral, and chipset buses that communicatively connect the numerous internal devices of the electronic system  2400 . For instance, the bus  2405  communicatively connects the processing unit(s)  2410  with the read-only memory  2430 , the GPU  2415 , the system memory  2420 , and the permanent storage device  2435 . 
     From these various memory units, the processing unit(s)  2410  retrieves instructions to execute and data to process in order to execute the processes of the invention. The processing unit(s) may be a single processor or a multi-core processor in different embodiments. Some instructions are passed to and executed by the GPU  2415 . The GPU  2415  can offload various computations or complement the image processing provided by the processing unit(s)  2410 . In some embodiments, such functionality can be provided using Corelmage&#39;s kernel shading language. 
     The read-only-memory (ROM)  2430  stores static data and instructions that are needed by the processing unit(s)  2410  and other modules of the electronic system. The permanent storage device  2435 , on the other hand, is a read-and-write memory device. This device is a non-volatile memory unit that stores instructions and data even when the electronic system  2400  is off. Some embodiments of the invention use a mass-storage device (such as a magnetic or optical disk and its corresponding disk drive, integrated flash memory) as the permanent storage device  2435 . 
     Other embodiments use a removable storage device (such as a floppy disk, flash memory device, etc., and its corresponding drive) as the permanent storage device. Like the permanent storage device  2435 , the system memory  2420  is a read-and-write memory device. However, unlike storage device  2435 , the system memory  2420  is a volatile read-and-write memory, such a random access memory. The system memory  2420  stores some of the instructions and data that the processor needs at runtime. In some embodiments, the invention&#39;s processes are stored in the system memory  2420 , the permanent storage device  2435 , and/or the read-only memory  2430 . For example, the various memory units include instructions for processing multimedia clips in accordance with some embodiments. From these various memory units, the processing unit(s)  2410  retrieves instructions to execute and data to process in order to execute the processes of some embodiments. 
     The bus  2405  also connects to the input and output devices  2440  and  2445 . The input devices  2440  enable the user to communicate information and select commands to the electronic system. The input devices  2440  include alphanumeric keyboards and pointing devices (also called “cursor control devices”), cameras (e.g., webcams), microphones or similar devices for receiving voice commands, etc. The output devices  2445  display images generated by the electronic system or otherwise output data. The output devices  2445  include printers and display devices, such as cathode ray tubes (CRT) or liquid crystal displays (LCD), as well as speakers or similar audio output devices. Some embodiments include devices such as a touchscreen that function as both input and output devices. 
     Finally, as shown in  FIG. 24 , bus  2405  also couples electronic system  2400  to a network  2425  through a network adapter (not shown). In this manner, the computer can be a part of a network of computers (such as a local area network (“LAN”), a wide area network (“WAN”), or an Intranet), or a network of networks, such as the Internet. Any or all components of electronic system  2400  may be used in conjunction with the invention. 
     Some embodiments include electronic components, such as microprocessors, storage and memory that store computer program instructions in a machine-readable or computer-readable medium (alternatively referred to as computer-readable storage media, machine-readable media, or machine-readable storage media). Some examples of such computer-readable media include RAM, ROM, read-only compact discs (CD-ROM), recordable compact discs (CD-R), rewritable compact discs (CD-RW), read-only digital versatile discs (e.g., DVD-ROM, dual-layer DVD-ROM), a variety of recordable/rewritable DVDs (e.g., DVD-RAM, DVD-RW, DVD+RW, etc.), flash memory (e.g., SD cards, mini-SD cards, micro-SD cards, etc.), magnetic and/or solid state hard drives, read-only and recordable Blu-Ray® discs, ultra density optical discs, any other optical or magnetic media, and floppy disks. The computer-readable media may store a computer program that is executable by at least one processing unit and includes sets of instructions for performing various operations. Examples of computer programs or computer code include machine code, such as is produced by a compiler, and files including higher-level code that are executed by a computer, an electronic component, or a microprocessor using an interpreter. 
     While the above discussion primarily refers to microprocessor or multi-core processors that execute software, some embodiments are performed by one or more integrated circuits, such as application specific integrated circuits (ASICs) or field programmable gate arrays (FPGAs). In some embodiments, such integrated circuits execute instructions that are stored on the circuit itself. In addition, some embodiments execute software stored in programmable logic devices (PLDs), ROM, or RAM devices. 
     As used in this specification and any claims of this application, the terms “computer”, “server”, “processor”, and “memory” all refer to electronic or other technological devices. These terms exclude people or groups of people. For the purposes of the specification, the terms display or displaying means displaying on an electronic device. As used in this specification and any claims of this application, the terms “computer readable medium,” “computer readable media,” and “machine readable medium” are entirely restricted to tangible, physical objects that store information in a form that is readable by a computer. These terms exclude any wireless signals, wired download signals, and any other ephemeral signals. 
     V. Map Service Environment 
     Various embodiments may operate within a map service operating environment.  FIG. 25  illustrates a map service operating environment, according to some embodiments. A map service  2530  (also referred to as mapping service) may provide map services for one or more client devices  2502   a - 6202   c  in communication with the map service  2530  through various communication methods and protocols. A map service  2530  in some embodiments provides map information and other map-related data, such as two-dimensional map image data (e.g., aerial view of roads utilizing satellite imagery), three-dimensional map image data (e.g., traversable map with three-dimensional features, such as buildings), route and direction calculations (e.g., ferry route calculations or directions between two points for a pedestrian), real-time navigation data (e.g., turn-by-turn visual navigation data in two or three dimensions), location data (e.g., where the client device is currently located), and other geographic data (e.g., wireless network coverage, weather, traffic information, or nearby points-of-interest). In various embodiments, the map service data may include localized labels for different countries or regions. Localized labels may be utilized to present map labels (e.g., street names, city names, points of interest) in different languages on client devices. Client devices  2502   a - 6202   c  may utilize these map services by obtaining map service data. Client devices  2502   a - 6202   c  may implement various techniques to process map service data. Client devices  2502   a - 6202   c  may then provide map services to various entities, including, but not limited to, users, internal software or hardware modules, and/or other systems or devices external to the client devices  2502   a - 6202   c.    
     In some embodiments, a map service is implemented by one or more nodes in a distributed computing system. Each node may be assigned one or more services or components of a map service. Some nodes may be assigned the same map service or component of a map service. A load balancing node in some embodiments distributes access or requests to other nodes within a map service. In some embodiments a map service is implemented as a single system, such as a single server. Different modules or hardware devices within a server may implement one or more of the various services provided by a map service. 
     A map service in some embodiments provides map services by generating map service data in various formats. In some embodiments, one format of map service data is map image data. Map image data provides image data to a client device so that the client device may process the image data (e.g., rendering and/or displaying the image data as a two-dimensional or three-dimensional map). Map image data, whether in two or three dimensions, may specify one or more map tiles. A map tile may be a portion of a larger map image. Assembling together the map tiles of a map produces the original map. Tiles may be generated from map image data, routing or navigation data, or any other map service data. In some embodiments map tiles are raster-based map tiles, with tile sizes ranging from any size both larger and smaller than a commonly-used 256 pixel by 256 pixel tile. Raster-based map tiles may be encoded in any number of standard digital image representations including, but not limited to, Bitmap (.bmp), Graphics Interchange Format (.gif), Joint Photographic Experts Group (.jpg, .jpeg, etc.), Portable Networks Graphic (.png), or Tagged Image File Format (.tiff). In some embodiments, map tiles are vector-based map tiles, encoded using vector graphics, including, but not limited to, Scalable Vector Graphics (.svg) or a Drawing File (.drw). Some embodiments also include tiles with a combination of vector and raster data. Metadata or other information pertaining to the map tile may also be included within or along with a map tile, providing further map service data to a client device. In various embodiments, a map tile is encoded for transport utilizing various standards and/or protocols, some of which are described in examples below. 
     In various embodiments, map tiles may be constructed from image data of different resolutions depending on zoom level. For instance, for low zoom level (e.g., world or globe view), the resolution of map or image data need not be as high relative to the resolution at a high zoom level (e.g., city or street level). For example, when in a globe view, there may be no need to render street level artifacts as such objects would be so small as to be negligible in many cases. 
     A map service in some embodiments performs various techniques to analyze a map tile before encoding the tile for transport. This analysis may optimize map service performance for both client devices and a map service. In some embodiments map tiles are analyzed for complexity, according to vector-based graphic techniques, and constructed utilizing complex and non-complex layers. Map tiles may also be analyzed for common image data or patterns that may be rendered as image textures and constructed by relying on image masks. In some embodiments, raster-based image data in a map tile contains certain mask values, which are associated with one or more textures. Some embodiments also analyze map tiles for specified features that may be associated with certain map styles that contain style identifiers. 
     Other map services generate map service data relying upon various data formats separate from a map tile in some embodiments. For instance, map services that provide location data may utilize data formats conforming to location service protocols, such as, but not limited to, Radio Resource Location services Protocol (RRLP), TIA 801 for Code Division Multiple Access (CDMA), Radio Resource Control (RRC) position protocol, or LTE Positioning Protocol (LPP). Embodiments may also receive or request data from client devices identifying device capabilities or attributes (e.g., hardware specifications or operating system version) or communication capabilities (e.g., device communication bandwidth as determined by wireless signal strength or wire or wireless network type). 
     A map service may obtain map service data from internal or external sources. For example, satellite imagery used in map image data may be obtained from external services, or internal systems, storage devices, or nodes. Other examples may include, but are not limited to, GPS assistance servers, wireless network coverage databases, business or personal directories, weather data, government information (e.g., construction updates or road name changes), or traffic reports. Some embodiments of a map service may update map service data (e.g., wireless network coverage) for analyzing future requests from client devices. 
     Various embodiments of a map service may respond to client device requests for map services. These requests may be for a specific maps or portions of a map. Some embodiments format requests for a map as requests for certain map tiles. In some embodiments, requests also supply the map service with starting locations (or current locations) and destination locations for a route calculation. A client device may also request map service rendering information, such as map textures or style sheets. In at least some embodiments, requests are also one of a series of requests implementing turn-by-turn navigation. Requests for other geographic data may include, but are not limited to, requests for current location, wireless network coverage, weather, traffic information, or nearby points-of-interest. 
     A map service, in some embodiments, analyzes client device requests to optimize a device or map service operation. For instance, a map service may recognize that the location of a client device is in an area of poor communications (e.g., weak wireless signal) and send more map service data to supply a client device in the event of loss in communication or send instructions to utilize different client hardware (e.g., orientation sensors) or software (e.g., utilize wireless location services or Wi-Fi positioning instead of GPS-based services). In another example, a map service may analyze a client device request for vector-based map image data and determine that raster-based map data better optimizes the map image data according to the image&#39;s complexity. Embodiments of other map services may perform similar analysis on client device requests and, as such, the above examples are not intended to be limiting. 
     Various embodiments of client devices (e.g., client devices  2502   a - 6202   c ) are implemented on different portable-multifunction device types. Client devices  2502   a - 6202   c  utilize map service  2530  through various communication methods and protocols. In some embodiments, client devices  2502   a - 6202   c  obtain map service data from map service  2530 . Client devices  2502   a - 6202   c  request or receive map service data. Client devices  2502   a - 6202   c  then process map service data (e.g., render and/or display the data) and may send the data to another software or hardware module on the device or to an external device or system. 
     A client device, according to some embodiments, implements techniques to render and/or display maps. These maps may be requested or received in various formats, such as map tiles described above. A client device may render a map in two-dimensional or three-dimensional views. Some embodiments of a client device display a rendered map and allow a user, system, or device providing input to manipulate a virtual camera in the map, changing the map display according to the virtual camera&#39;s position, orientation, and field-of-view. Various forms and input devices are implemented to manipulate a virtual camera. In some embodiments, touch input, through certain single or combination gestures (e.g., touch-and-hold or a swipe) manipulate the virtual camera. Other embodiments allow manipulation of the device&#39;s physical location to manipulate a virtual camera. For instance, a client device may be tilted up from its current position to manipulate the virtual camera to rotate up. In another example, a client device may be tilted forward from its current position to move the virtual camera forward. Other input devices to the client device may be implemented including, but not limited to, auditory input (e.g., spoken words), a physical keyboard, mouse, and/or a joystick. 
     Some embodiments provide various visual feedback to virtual camera manipulations, such as displaying an animation of possible virtual camera manipulations when transitioning from two-dimensional map views to three-dimensional map views. Some embodiments also allow input to select a map feature or object (e.g., a building) and highlight the object, producing a blur effect that maintains the virtual camera&#39;s perception of three-dimensional space. 
     In some embodiments, a client device implements a navigation system (e.g., turn-by-turn navigation). A navigation system provides directions or route information, which may be displayed to a user. Some embodiments of a client device request directions or a route calculation from a map service. A client device may receive map image data and route data from a map service. In some embodiments, a client device implements a turn-by-turn navigation system, which provides real-time route and direction information based upon location information and route information received from a map service and/or other location system, such as a Global Positioning Satellite (GPS). A client device may display map image data that reflects the current location of the client device and update the map image data in real-time. A navigation system may provide auditory or visual directions to follow a certain route. 
     A virtual camera is implemented to manipulate navigation map data according to some embodiments. In some embodiments, the client devices allow the device to adjust the virtual camera display orientation to bias toward the route destination. Some embodiments also allow the virtual camera to navigate turns by simulating the inertial motion of the virtual camera. 
     Client devices implement various techniques to utilize map service data from map service. Some embodiments implement some techniques to optimize rendering of two-dimensional and three-dimensional map image data. In some embodiments, a client device locally stores rendering information. For instance, a client stores a style sheet, which provides rendering directions for image data containing style identifiers. In another example, common image textures may be stored to decrease the amount of map image data transferred from a map service. Client devices in different embodiments implement various modeling techniques to render two-dimensional and three-dimensional map image data, examples of which include, but are not limited to: generating three-dimensional buildings out of two-dimensional building footprint data; modeling two-dimensional and three-dimensional map objects to determine the client device communication environment; generating models to determine whether map labels are seen from a certain virtual camera position; and generating models to smooth transitions between map image data. In some embodiments, the client devices also order or prioritize map service data in certain techniques. For instance, a client device detects the motion or velocity of a virtual camera, which if exceeding certain threshold values, lower-detail image data is loaded and rendered for certain areas. Other examples include: rendering vector-based curves as a series of points, preloading map image data for areas of poor communication with a map service, adapting textures based on display zoom level, or rendering map image data according to complexity. 
     In some embodiments, client devices communicate utilizing various data formats separate from a map tile. For instance, some client devices implement Assisted Global Positioning Satellites (A-GPS) and communicate with location services that utilize data formats conforming to location service protocols, such as, but not limited to, Radio Resource Location services Protocol (RRLP), TIA 801 for Code Division Multiple Access (CDMA), Radio Resource Control (RRC) position protocol, or LTE Positioning Protocol (LPP). Client devices may also receive GPS signals directly. Embodiments may also send data, with or without solicitation from a map service, identifying the client device&#39;s capabilities or attributes (e.g., hardware specifications or operating system version) or communication capabilities (e.g., device communication bandwidth as determined by wireless signal strength or wire or wireless network type). 
       FIG. 25  illustrates one possible embodiment of an operating environment  2500  for a map service  2530  and client devices  2502   a - 6202   c . In some embodiments, devices  2502   a ,  2502   b , and  2502   c  communicate over one or more wire or wireless networks  2510 . For example, wireless network  2510 , such as a cellular network, can communicate with a wide area network (WAN)  2520 , such as the Internet, by use of gateway  2514 . A gateway  2514  in some embodiments provides a packet oriented mobile data service, such as General Packet Radio Service (GPRS), or other mobile data service allowing wireless networks to transmit data to other networks, such as wide area network  2520 . Likewise, access device  2512  (e.g., IEEE 802.11g wireless access device) provides communication access to WAN  2520 . Devices  2502   a  and  2502   b  can be any portable electronic or computing device capable of communicating with a map service. Device  2502   c  can be any non-portable electronic or computing device capable of communicating with a map service. 
     In some embodiments, both voice and data communications are established over wireless network  2510  and access device  2512 . For instance, device  2502   a  can place and receive phone calls (e.g., using voice over Internet Protocol (VoIP) protocols), send and receive e-mail messages (e.g., using Simple Mail Transfer Protocol (SMTP) or Post Office Protocol 3 (POP3)), and retrieve electronic documents and/or streams, such as web pages, photographs, and videos, over wireless network  2510 , gateway  2514 , and WAN  2520  (e.g., using Transmission Control Protocol/Internet Protocol (TCP/IP) or User Datagram Protocol (UDP)). Likewise, in some implementations, devices  2502   b  and  2502   c  can place and receive phone calls, send and receive e-mail messages, and retrieve electronic documents over access device  2512  and WAN  2520 . In various embodiments, any of the illustrated client devices may communicate with map service  2530  and/or other service(s)  2550  using a persistent connection established in accordance with one or more security protocols, such as the Secure Sockets Layer (SSL) protocol or the Transport Layer Security (TLS) protocol. 
     Devices  2502   a  and  2502   b  can also establish communications by other means. For example, wireless device  2502   a  can communicate with other wireless devices (e.g., other devices  2502   b , cell phones, etc.) over the wireless network  2510 . Likewise devices  2502   a  and  2502   b  can establish peer-to-peer communications  2540  (e.g., a personal area network) by use of one or more communication subsystems, such as Bluetooth®. Device  2502   c  can also establish peer to peer communications with devices  2502   a  or  2502   b  (not shown). Other communication protocols and topologies can also be implemented. Devices  2502   a  and  2502   b  may also receive Global Positioning Satellite (GPS) signals from GPS satellites  2560 . 
     Devices  2502   a ,  2502   b , and  2502   c  can communicate with map service  2530  over one or more wired and/or wireless networks,  2512  or  2510 . For instance, map service  2530  can provide map service data to rendering devices  2502   a ,  2502   b , and  2502   c . Map service  2530  may also communicate with other services  2550  to obtain data to implement map services. Map service  2530  and other services  2550  may also receive GPS signals from GPS satellites  2560 . 
     In various embodiments, map service  2530  and/or other service(s)  2550  are configured to process search requests from any of the client devices. Search requests may include but are not limited to queries for businesses, addresses, residential locations, points of interest, or some combination thereof. Map service  2530  and/or other service(s)  2550  may be configured to return results related to a variety of parameters including but not limited to a location entered into an address bar or other text entry field (including abbreviations and/or other shorthand notation), a current map view (e.g., user may be viewing one location on the multifunction device while residing in another location), current location of the user (e.g., in cases where the current map view did not include search results), and the current route (if any). In various embodiments, these parameters may affect the composition of the search results (and/or the ordering of the search results) based on different priority weightings. In various embodiments, the search results that are returned may be a subset of results selected based on specific criteria including but not limited to a quantity of times the search result (e.g., a particular point of interest) has been requested, a measure of quality associated with the search result (e.g., highest user or editorial review rating), and/or the volume of reviews for the search results (e.g., the number of times the search result has been review or rated). 
     In various embodiments, map service  2530  and/or other service(s)  2550  are configured to provide auto-complete search results that are displayed on the client device, such as within the mapping application. For instance, auto-complete search results may populate a portion of the screen as the user enters one or more search keywords on the multifunction device. In some cases, this feature may save the user time as the desired search result may be displayed before the user enters the full search query. In various embodiments, the auto complete search results may be search results found by the client on the client device (e.g., bookmarks or contacts), search results found elsewhere (e.g., from the Internet) by map service  2530  and/or other service(s)  2550 , and/or some combination thereof. As is the case with commands, any of the search queries may be entered by the user via voice or through typing. The multifunction device may be configured to display search results graphically within any of the map display described herein. For instance, a pin or other graphical indicator may specify locations of search results as points of interest. In various embodiments, responsive to a user selection of one of these points of interest (e.g., a touch selection, such as a tap), the multifunction device is configured to display additional information about the selected point of interest including but not limited to ratings, reviews or review snippets, hours of operation, store status (e.g., open for business, permanently closed, etc.), and/or images of a storefront for the point of interest. In various embodiments, any of this information may be displayed on a graphical information card that is displayed in response to the user&#39;s selection of the point of interest. 
     In various embodiments, map service  2530  and/or other service(s)  2550  provide one or more feedback mechanisms to receive feedback from client devices  2502   a - 6202   c . For instance, client devices may provide feedback on search results to map service  2530  and/or other service(s)  2550  (e.g., feedback specifying ratings, reviews, temporary or permanent business closures, errors etc.); this feedback may be used to update information about points of interest in order to provide more accurate or more up-to-date search results in the future. In some embodiments, map service  2530  and/or other service(s)  2550  may provide testing information to the client device (e.g., an A/B test) to determine which search results are best. For instance, at random intervals, the client device may receive and present two search results to a user and allow the user to indicate the best result. The client device may report the test results to map service  2530  and/or other service(s)  2550  to improve future search results based on the chosen testing technique, such as an A/B test technique in which a baseline control sample is compared to a variety of single-variable test samples in order to improve results. 
     While the invention has been described with reference to numerous specific details, one of ordinary skill in the art will recognize that the invention can be embodied in other specific forms without departing from the spirit of the invention. For instance, many of the figures illustrate various touch gestures (e.g., taps, double taps, swipe gestures, press and hold gestures, etc.). However, many of the illustrated operations could be performed via different touch gestures (e.g., a swipe instead of a tap, etc.) or by non-touch input (e.g., using a cursor controller, a keyboard, a touchpad/trackpad, a near-touch sensitive screen, etc.). In addition, a number of the figures conceptually illustrate processes. The specific operations of these processes may not be performed in the exact order shown and described. The specific operations may not be performed in one continuous series of operations, and different specific operations may be performed in different embodiments. Furthermore, the process could be implemented using several sub-processes, or as part of a larger macro process.

Metadata:
Filing Date: 20131017
Publication Date: 20160301
Grant Date: 20160301
Priority Date: 20130609
Inventors: CARLHIAN ALEXANDRE
GODFREY EDOUARD D.
DRUKMAN MAXWELL O.
Assignee: APPLE INC
CPC Classifications: [{"code": "G01C21/3632", "inventive": true, "first": true, "tree": "[]"}, {"code": "G01C21/3626", "inventive": true, "first": true, "tree": "[]"}, {"code": "G01C21/3632", "inventive": true, "first": false, "tree": "[]"}, {"code": "G01S19/42", "inventive": true, "first": false, "tree": "[]"}, {"code": "G01C21/3632", "inventive": true, "first": true, "tree": "[]"}]
Family ID: 52006164