Thought a separate thread specific to this new device might be in order.

I just acquired mine as a safety backup to my Garmin GPSMap 541s Marine Chartplotter and so I can go handheld on land, driving, geocaching, etc.

There are lots of posts and instructions in the other Garmin related forums about maps and additional files for various Garmin Nuvi models.

My initial question is whether or not all of the information given here for the Nuvi 3790 model is also equally applicable to the Montana?

In other words, can all the various Garmin Marine, Road, and Topo Maps, and related additional 'features' files, be loaded onto the Montana internal memory and/or micro-SD cards the same way as for the Nuvi 3790?