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In the past year, I mounted a transducer on my 1988 Montauk 17 on the starboard side on a "Stern Saver," aligned pretty much directly underneath the splashwell drain tube. I mounted it as far up the stern as allowed depth to be read at speed to avoid as much drag, etc as possible. I started with the transducer mounted so its base was flush with the bottom of the hull, and then moved it up and down from there in small (1/4") increments to optimize after seeing how it performed in the water at various speeds.