Question about Garmin nuvi 255W GPS Receiver
The maps are stored in specific mapset files with *.img extension in
the flash memory of the GPS unit. Each mapset file contains one or many
maps in it. 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".
Here are the mapset files supported by Garmin Nuvi 255w GPS navigator:
You will lost all the maps in the previous mapset file if it is overwritten by a new file with same filename. If you want to keep the existing maps, ensure that you store the mapset file with an unused filename (from the 5 filenames above). Alternatively, you can make use of special tools to merge new maps into existing mapset file.
You can view the name of your base map in Tools > Settings > System > About > Basemap.
You can view the name of maps in the other mapset files in Tools > Settings > Map > Map Info. There, you can tell the GPS to load the map by checking on its name, or not to use the map by unchecking it.
In case there are 2 or more non-overlaping maps available for the same location, the map with the highest priority number (defined in the map itself) will be used by the GPS.
Note that certain map which are locked by vendor need a 25 bytes unlock key stored in a *.unl file in the same folder and with the same name as the mapset file where the locked map is stored in.
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Posted on Mar 13, 2011
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Posted on Jan 02, 2017
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