well on some garmin units you can put multiple maps by naming them in the order like this.:
you must set your map name follow these name:
Gmapbmap.img -->base map. you can put your detailed map here too but some garmin units do not route basemap.
Gmapsupp.img -->your map. first supplementary map
Gmapsup2.img -->another map. second supplementary map
Gmapprom.img -->another map. the built in map name. can be used for any map img but on some units you cant select/deselect in map source.
hope this helps. this has been tested on mobile XT and nuvi 1460
Garmin will read into these file and show on screen. tell us if it does not work on your gps unit.
All your maps may save as "\MiniSD Card\Garmin\".
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