I've been very happy with a small Lowrance M68c color fishfinder/plotter. Compact and more features than any human can ever use. Mounted on helm dash. Internal antenna works fine and I use "shoot thru hull" transducer. Paid $399 for it years ago.
I don't see it in West Marine catalog this year but "Elite-4" model looks like a replacement. $370 You can get a greyscale version for $250.
Whatever you get, I suggest you get something designed to be mounted in a boat.
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