I am a big fan of the Lowrance Mark 5DSI unit. It gives you down imaging and cost about 300 bucks. It's black and white, and does not have a gps, but it will give you a big leg up compared to a normal fishfinder in terms of what is below the boat. If you are wanting to spend more you can never go wrong with sidescan but you have to willing to spend some cash to get one.



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