Composite Research, Inc.

Composite Research, Inc.
Makers of Sundance, Sea Born, and Spyder Boats

My P58, P48, P52, P66, TM256, TM258, TM260, TM270W transom-mount transducer is not working well at speeds above 10 knots. What can I do?

Transom mount transducers—while they are the easiest to install, can be the hardest to get working properly at speed. Fine
adjustments are needed for good high speed performance.

Please check the following for troubleshooting your transom mount transducer:

  • Transom mount transducers will not work at any speed if they are installed on a powerboat boat with inboard motors,
    or any sailboat.
  • If you have a single engine outboard, or I/O, make sure that the unit is mounted on the starboard side of the boat, so it is
    free from most prop wash.
  • If you have a twin, or triple engine outboard, or I/O make sure that the unit is mounted between the motors, as low as
    possible, either on the flat section of the keel (if any), or slightly left or right of the vee.
  • If you are still seeing poor performance at speed, this usually indicates that the transducer needs to be mounted lower
    so that more of the face of the transducer is in contact with the water at speed.
  • To make this adjustment, loosen the mounting screws, and slide the transducer 1/2″ lower and re-test. You may need to
    re-drill holes. If you do so, be sure to seal the old holes with manufacturer approved, below the waterline caulking or
  • You also may want to add another plastic wedge (supplied with the installation kit) so that when looking at the side of
    the transducer the back or stern of the transducer is noticably lower than the bow or front of the transducer. This angle
    will not affect depth readings. Doing this adjustmant will help keep the transducer in hard contact with the water at
    higher speeds.

The picture below illustrates lowering and angling your transom mount.

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