I have a 1974 41 Commander. I am considering adding a Garmin GPS unit. Has anyone used an "in the hull" transducer? How did it perform? The Garmin in the hull unit is limited to 5/8" thick fiberglass. Does anyone know the approximate thickness of a Commander hull off center from the keel?
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In the past I've answered this but a quick summary, I made a dam surrounding the location for the Puck, left the thru hull in place, made runs on the same GPS track with each and didn't find significant differences. I cleaned the area for the Puck, bonded it to the hull and at the next haul out another hole in the hull was eliminated.
Tim
FXA350030H