Garmin Montana uses the same basemap (gmapbmap.img) as most other Garmin units - [Only registered and activated users can see links. ]
If you instead are looking for the Montana 650t pre-installed Topo "Recreation Map Europe" - [Only registered and activated users can see links. ]
Nobody has uploaded the similar file from a U.S. 650t but this should be close enough - [Only registered and activated users can see links. ]
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