| 摘要 |
PROBLEM TO BE SOLVED: To efficiently update map data provided in a navigation system. SOLUTION: A map data client determines an updating zone according to a present position or the like and, through an inter-vehicle communication device 14, contacts other navigation system 1 for the presence or absence of having newer version of mesh data than the mesh data stored in a map data storage unit 101. When there is a response, the mesh data are downloaded from the other navigation system 1, which is the source of the response, to update the mesh data in the map data storage unit 101. A map data server 110 provides the other navigation system 1 with response services to the contact and map data downloading services through the inter-vehicle communication device 14. COPYRIGHT: (C)2004,JPO&NCIPI |
