Patent ID: 8554469

Claim:
An update unit for a vehicle for updating a digital map, said update unit comprising: a map unit with a digital map for displaying a travel route on the map; wherein the update unit is configured to request an update of a required portion of the map from a system control center; and wherein the update unit is also configured to: receive the requested update of the required portion of the map when the system control center determines that the required portion of the map should be updated based on a comparison between the requested portion and a stored portion stored at the system control center, the map unit displaying the update of the required portion of the map, wherein when the system control center determines that the required portion of the map should not be updated based on the comparison between the requested portion and the stored portion stored at the system control center, the update unit does not receive the requested update, and the map unit displays the required portion of the map, wherein the system control center is also configured to initiate retrieval of the update of the required portion of the map without receiving a request from the update unit of the vehicle, wherein the system control center is configured to cyclically check the required portion of the map for changes, and wherein the system control center is also configured to establish a degree for the changes in the required portion of the map.