You can view the name of your base map in Tools > Settings > System > About > Basemap. Alternatively, you can make use of special tools to merge new maps into existing mapset file. If you want to keep the existing maps, ensure that you store the mapset file with an unused filename (from the 5 filenames above). You will lost all the maps in the previous mapset file if it is overwritten by a new file with same filename. Normally new maps installed by the user will be stored in gmapsupp.img. Therefore, the Garmin Nuvi 255w GPS supports up to 6 mapset files, including 1 in SD card. gmapsupp.img - the supplemental mapset which you can have one in the GPS flash memory and another one in the attached SD card.gmapoem.img - the OEM mapset that cannot be unselect by user (if it exist).Here are the mapset files supported by Garmin Nuvi 255w GPS navigator: Beside that, the Garmin GPS navigator can also recognise and load up one additional mapset file from SD card residing in the " Garmin" folder and named as " gmapsupp.img". Each mapset file contains one or many maps in it. The maps are stored in specific mapset files with *.img extension in the flash memory of the GPS unit. The limit is on the maximum file size (about 2GB per file) and available storage memory. Theoretically, the Garmin Nuvi GPS navigator can be loaded with hundreds of map.
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