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Want to replace old thru hull transducer(not even hooked up anymore) with an Airmar B60 tilted element. Not sure if the 12 or 20 deg is correct. Airmar suggests mounting it as close to center of keel as possible. The keel in that location is rounded. I would think that the 12 deg would work as the rise of the hull at that point is not steep. Any thoughts/suggestions?