I have an Etrex Legend that I used to find the north pole. If you get the Mapsource Eastern US Topo software from Garmin you get a fair map of the lake. If you then buy the waypoint file software from Bizer and load the waypoints and the map into the Etrex you have a pretty good (but not great) lake map. Then again you can only see it on that tiny display anyway.
You can enter the waypoints for free but it takes a lot of time.
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