Method for updating map data used in on-vehicle navigation apparatus, map data update system, authentication key generation apparatus and navigation apparatus

摘要

In a map data update method for updating map data used in an on-vehicle navigation apparatus by installing update map data, an authentication key is generated based upon an apparatus-inherent ID assigned in correspondence to the navigation apparatus and the use of update map data installed in the navigation apparatus is enabled or disabled by verifying the authentication key assigned to the navigation apparatus.