Method of updating a database of a navigation device and navigation device

摘要

To update a database of a navigation device which stores at least a base version of a digital map, versions of the digital map which are available locally in the database or remotely from the navigation device are identified. To execute the navigation task, a version of the digital map is selected for execution of the navigation task. Data from a sub-set of storage blocks in which the selected version is stored is required to execute the navigation task. Depending on whether all storage blocks of the sub-set are already stored locally in the database, data stored in storage blocks of the sub-set which are not yet stored locally in the database are downloaded via a wireless interface. The downloaded data are stored in the database without modifying the base version of the digital map.

主权项

1. A method of updating a database of a navigation device, the database storing at least a base version of a digital map for a geographical area, the method comprising:
identifying versions of the map for the geographical area which are available locally in the database or remotely from the navigation device; executing a navigation task, including selecting, based on the identified versions, a version of the digital map for execution of the navigation task, the selected version including data stored in a plurality of storage blocks, wherein data from a sub-set of said plurality of storage blocks is required to execute the navigation task; selectively downloading over a wireless interface, depending on whether all storage blocks of the sub-set are already stored locally in the database, data stored in storage blocks of the sub-set which are not yet stored locally in the database, and storing the downloaded data in the database without modifying the base version of the digital map; and using the data of the sub-set to execute the navigation task.