Big fan of the Garmin units. I currently have the GPSMAP 743 (7 inch screen) and had something similar on my last boat. They come preloaded with US lake maps and if you want to spend the extra money you can get their LakeVu Ultra maps. Simple to use and reliable. As long as you have the room/budget the bigger units are nice to have. They go on sale from time to time so keep your eye out.
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