Patent ID: 6757609
Filing Date: 2004-06-29
Classification: G01C,G08G

Abstract:
A vehicle navigation server comprising:a travel route calculating device for calculating at least one proposed travel route of a vehicle based on data input by a registrant to the server, the data including a current or start position and a destination of the vehicle; a map mesh defining device for defining a map mesh consisting of mesh units, which contains the proposed travel route; a traffic information extracting device for extracting traffic information relating to each mesh unit of the proposed travel route from a traffic information storage device, wherein the traffic information relating to the mesh unit which includes the start or current position of the vehicle is obtained first; a data amount monitoring device for monitoring a total amount of extracted information, wherein the data amount monitoring device terminates information extraction when the total amount of extracted information becomes equal to or larger than a predetermined value; and a data sending device for sending the extracted traffic information to a vehicle navigation device associated with the vehicle.