Patent ID: 6314369
Filing Date: 2001-11-06
Classification: G01C,G08G

Abstract:
A communications navigation system in which data communications are transmitted and received between a navigation base apparatus provided at a navigation base and each of a plurality of navigation apparatuses provided in moving bodies such as vehicles,wherein at least one navigation apparatus of the plurality of the navigation apparatuses includes:(a) transmitting means for transmitting, to the navigation base apparatus, at least current position data for a current position of one moving body on which the one navigation apparatus is mounted, destination data indicating a destination thereof and identification data identifying the one navigation apparatus,(b) receiving means for receiving data from the navigation base apparatus, and(c) route guidance means for providing route guidance using the data received from the navigation base apparatus; andwherein the navigation base apparatus includes:(a) route/guidance information storage means which stores route/guidance information therein;(b) route search means for searching to determine a recommended route based on the current position data and the destination data received from the one navigation apparatus;(c) determination means for determining, based on the identification data received from the one navigation apparatus, necessary route/guidance information that a user of the one navigation apparatus needs to have with regard to the recommended route,wherein the navigation base apparatus extracts route/guidance data corresponding to the necessary route/guidance information determined by the determination means from the route/guidance information stored in the route/guidance information storage means, and then transmits the extracted route/guidance data to the navigation apparatus identified by the identification data; andsegmented data producing means for producing segmented data by dividing the extracted route/guidance data geographically into a plurality of data segments which link together geographically in series along the recommended route, for transmission of the extracted route/guidance data in the form of said plurality of data segments to the one navigation apparatus, each data segment containing route/guidance data for a geographical part of the recommended route and being independently usable in the one navigation apparatus for route guidance.