Patent ID: 8515667

Claim:
A power saving navigation device comprising a display, the device being capable of acquiring the current location of the device and a user specified desired destination, the device further arranged to: request navigation information for a route based on the acquired current location and the desired destination; display said requested route on said display of said navigation device and guiding a user along said route; determine a span value for the next expected guiding information; determine a threshold value for power saving management, wherein said threshold includes at least one of a predetermined time and distance; compare said span value to said threshold value; a processor is configured to activate the power saving mode if said span value exceeds said threshold value, wherein said power saving mode comprises turning off the background light of the display of said navigation device and changing at least one display indicia, said at least one display indicia including one or more of a map and visual guidance icons, wherein changing said at least one display indicia includes changing one or more of the colors of a map, font size, font color, and size of visual guidance icons, such that the at least one display indicia can be seen without a backlight, wherein the power saving mode is an independent feature of said device that is being activated by the processor after a certain time of inactivity, wherein said device compares said span value to said threshold value and sends an activity signal when said threshold value exceeds said span value.