Re: all this work for a boat ride!
I mounted my transducer inside the bilge shooting thru the hull. I used a piece of 4" PVC cut to match the hull, 4200 to the hull and used the cheap $120 plastic transducer. A piece of plywood suspending the unit and filled the pipe with non-toxic antifreeze.
Over 1400 feet is the deepest I've read with this setup.
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