I use a Garmin eTrex Vista C and it works great. It's IPX7 waterproof, it floats, its color, and its relatively small. Walmart sells them for around $250, but you could probably find it cheaper online. It also interfaces with my Raymarine DS400X. If you are looking for a purely marine chartplotting unit you would probably be better off with something else. But if you want something small and convenient, that can autoroute you in your car also, I would go with the eTrex.
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