To see topo maps is better to use Basecamp.
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You can put the img in an sd too, in a Garmin directory , Basecamp will see it. read also here coz some maps need a trick to see them in basecamp
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Have you put Mapsource details at max when using it?
You can put a map in internal memory probably named gmapsupp.img or gmapprom1.img, must test it
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