Patent ID: 7089111
Filing Date: 2006-08-08
Classification: G01C

Abstract:
1. A vehicle navigation system provided with guidance target point storing means for storing information about guidance target points, which are extracted from information about a preset route extending from a current position of a vehicle to a destination and which is based on map information, and guidance means for providing guidance on said route by voice or with display, said system comprising: travel-time-between-guidance-target-points determining means for determining either one of a travel time required for the vehicle to travel on a road between two successive guidance target points whose information is extracted from the information stored in said guidance target point storing means or a speed limit on the road; continuous guidance threshold distance setting means for setting a threshold distance for continuous guidance based on the travel time or the speed limit determined by said travel-time-between-guidance-target-points determining means; distance-between-guidance-target-points calculating means for calculating a distance between the two successive guidance target points whose information is extracted from the information stored in said guidance target point storing means; and route guidance means for providing continuous guidance through said guidance means when the calculated distance between the two successive guidance target points is shorter than the threshold distance for continuous guidance set by said continuous guidance threshold distance setting means.