Patent ID: 8478522

Claim:
A map-updating-data creating method for updating old map data to new map data in a navigation system configured to provide navigation guidance to a user, the old map data including a plurality of old map files, the map-updating-data creating method comprising: for each old map file to be updated, creating a temporary map-updating file to be used for overwriting or rewriting the old map file to a new map file; determining new serial numbers of updated map files in such a manner that previously assigned old serial numbers of non-updated map files are not changed and the new serial numbers sequentially follow the old serial numbers; creating a serial number management file in which marks are respectively written at positions corresponding to the new and old serial numbers of all the map files, wherein a mark is written at a serial number position in the serial number management file after map file updating and an indication is issued that file updating has been performed, and wherein no mark is written at the serial number position before map file updating and an indication is issued that file updating has not been performed; generating, by a map updating data processor, map-updating data while the navigation system simultaneously provides navigation guidance to the user, the map-dating data including the map-updating file and the serial number management file, wherein the new serial number is added to the map-updating file and an old map file is updated with the new serial number to a new map file; and overwriting the old map file to the new map file based on the map-updating file and the serial number management file to provide an updated region of the map; wherein said overwriting is performed in an entire updating mode by overwriting the old map file to the new map file in a sequential manner when navigation control is not performed based on a location corresponding to the old map file; wherein the entire updating mode is interrupted and the overwriting is performed in an on-demand mode when navigation control is requested to perform guidance based on a location corresponding to the old map file; and wherein the entire updating mode resumes when navigation control is no longer performed based on the location corresponding to the old map file, and navigation control is performed for the user based on the new map file.