Patent ID: 6427117
Filing Date: 2002-07-30
Classification: G01C

Abstract:
A navigation method in which navigation data concerning a route from a current position of a moving body to a destination is transmitted from a navigation center to the moving body, and then route guidance is carried out at the moving body using the navigation data received from the navigation center, the method comprising the steps of:(a) updating navigation information which includes various information concerning routes, the navigation information being stored in memory means provided in the navigation center; (b) conducting a route search for setting a route from a current position of the moving body to a destination on the basis of the newest navigation information updated in the updating step (a); (c) dividing the route set at the route searching step (b) into at least two portions; (d) extracting navigation data concerning at least a head portion of the route divided at the dividing step (c) from said memory means storing the newest navigation information updated in the updating step (a); (e) transmitting the navigation data extracted at the extracting step (d) from the navigation center to the moving body; (f) conducting a route search for setting a route from a current position of the moving body to the destination on the basis of the newest navigation information updated in the updating step (a) after transmitting the navigation data for the head portion to the moving body but before transmitting navigation data for a remaining portion of the route; (g) dividing the route set at the route searching step (f) into at least two portions; (h) extracting navigation data concerning at least a head portion of the route divided at the dividing step (g) from said memory means storing the newest navigation information updated at the updating step (a); and (i) transmitting the navigation data extracted at the extracting step (h) from the navigation center to the moving body.