Patent ID: 6629035
Filing Date: 2003-09-30
Classification: G08G

Abstract:
A navigation system for a vehicle, comprising:a communication unit connected to a server for delivering a map information; a map gaining unit connected to the communication unit thereby to gain the map information from the server through the communication unit; a display unit connected to the map gaining unit thereby to display the map information gained by the map gaining unit, in the form of a map image; a position detecting unit for detecting the position of the vehicle; a renewal time calculating unit for calculating a renewal time necessary to renew the map, the renewal time including a time for gaining the map information; a moving distance calculating unit for calculating a moving distance of the vehicle traveling during the renewal of the map; a road distance calculating unit for calculating a road distance required for the vehicle to travel from its present position to a margin of the map displayed on the display unit; a comparing unit for comparing the road distance with the moving distance; and an extraction-area setting unit for establishing the area of a new map to be displayed next to the map presently displayed on the display unit when the road distance agrees with the moving distance; wherein the map gaining unit transmits information about the area of the new map established by the extraction-area setting unit, to the server through the communication unit and further gains a new map information from the server thereby to carry out the renewal of the map displayed on the display unit.