Patent ID: 7421336
Filing Date: 2008-09-02
Classification: G01C

Abstract:
1. A navigation device comprising: a data storage unit for storing map data; a destination designating unit for designating a destination; a position deriving unit for deriving a current position of a user; a route receiving unit for receiving route data, the route data representing a route, from the current position derived by the position deriving unit, to the destination designated by the destination designating unit, and the route data being obtained according to the map data stored in the data storage unit; a data selecting unit for selecting candidate location data, the candidate location data indicating at least one location existing on the route represented by the route data or in a vicinity of the route and satisfying a predetermined condition, the candidate location data being selected based on the route data received by the route receiving unit and the map data stored in the data storage unit; a location-change designating unit for designating a location of change at which a method of guidance is to be changed, the location of change being designated based on the candidate location data selected by the data selecting unit; a determination unit for determining whether or not the user has reached the location of change based on the current position derived by the position deriving unit and the location of change designated by the location-change designating unit; and a navigation guidance unit for (i) guiding the user to the destination using detailed instructions associated with a method of guidance designated when the determination unit determines that the user has arrived at the location of change, and (ii) performing no process of navigation guidance while the determination unit determines that the user has not arrived at the location of change, wherein the location-change designating unit includes: