I was told not to mount the structure scan transducer on the trolling motor. It will distort the reading each each time you move the motor. Mine is mounted on the transom in the center of the boat about four inches above the bottom of the boat. It does not read on plane but does read as the boat slows and settles back into the water. My regular transducer is mounted in the hull. Let me know how yours does on the trolling motor. Thanks.