NAVIGATION DEVICE, MAP SERVER, MAP UPDATING SYSTEM, MAP UPDATING METHOD, AND MAP UPDATING PROGRAM

摘要

A navigation device, a map server, a map update system, a map update method and a map update program are provided, which shorten a communication time for communicating update data.;An update file for updating navigation map data is selected from a server file of server map data, which corresponds to a respective partition file of navigation map data and which is managed for every road update level corresponding to an updated road class in a partition. Such an update file satisfies a file determination attribute that specifies an update-targeted road class to be updated in a partition file.