If you have ever wondered how the map naming scheme works on Garmin devices it is really simple and can be used as a way to avoid merging maps.
Here are the map file names usable on a garmin device or simply put the GPS internal map names
gmapprom.img - Primary/Pre Installed Maps
gmaprom1.img - Secondary Mapset
gmapbmap.img - The base map
gmapoem - OEM Maps (cannot be deselected from device if used)
gmapsupp.img - Mapsets installed via Mapsource/Mapinstall
The SD or Micro SD card for a garmin device can only contain gmapsupp.img
This Screenshot shows an example of multiples maps on a single device using the naming conventions for garmin maps.
From what I can tell garmin map names are the same across all the nuvi devices I have looked at and it seems to be the best way to handle multiple garmin maps.
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