Till we were using just Mapsource , it was installing maps in Nuvis as gmapsupp.img and if you transferred another map in nuvi the previous gmapsupp.img was replaced and overwritten, recently all this has changed. We had new nuvis firmwares who support anyname.img and even in Garmin folder more than one gmapsupp.img is supported.
In outdoors gps everything is supported in Garmin folder, in nuvis everything is supported in Map folder.
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