It still sounds odd.
I have previously asked Garmin about this.
What they said was that you could enable multiple maps BUT not two (or more) for the same area.
The unit can only display one map at a time so how is it to know which one you want? that is what the enable/disable option is for.
Think about this:
If you have say city nav any country, then have say topo for the same country, then say osm for also the same country and then enable all three - which one do you see on the screen?
If you then ask the Montana to route somewhere ( and lets assume all 3 enabled maps are routeable) HOW is the Montana to know which mapset to use? it tries then crashes/freezes.
It is possible that you could also have a damaged unit '
Contact Garmin to discuss.
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