I use a Garmin for both
I use a Garmin Nuvi 550 with the Bizer map for boating and then transfer it to my snowmobile and use it with a snowmobile map made by Backwoodsgpstrails.com The Bizer map is really good. The Backwoods map has the major routes but not all of the club trails. If a club sends them a gps track of their trails then they will add it to their map.
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