Motor vehicle navigation system comprises an onboard system that can link to a data center for receipt of map updates, with map data configured in a layer structure to simplify updates to defined local areas

摘要

Navigation system comprises: a data center (51) for distribution of map data related to a defined region in response to a data request; and an onboard device (14) with a data store for map data, which is updated using data distributed by the data center. The distributed map data has a layered structure in which the highest layer represents a large area, while the lowest layer represents the defined region. The area represented by the highest layer includes the smaller defined region.