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Both the knotmeter and the sounder transducers should be placed forward of the keel/centerboard. As stated earlier, a knotmeter works best with unobstructed flow, and at sailboat speeds the turbulent wake of the keel/centerboard can be fairly wide. Also, the boundary layer gets thicker with distance from the "leading edge" (where the water first touches the hull). So, placing a knotmeter as far forward as possible, yet not so far forward that it will be seeing air from time to time, is best. The sounder transducer should be placed forward to prevent a "blind spot" from the keel/centerboard, and to give you a few seconds more time to react to any submerged hazard(s). One can place either or both transducers beside the keel, aft of the keel, on the transom, et cetera, but the result will be less than optimal.
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