24
Troubleshooting
No Speed Reading
• Is the insert installed in the housing and connected to the instrument/
Processor?
• Is the insert oriented with the arrow on the top pointing forward toward the bow
area and the cable exiting toward the stern? If the insert cannot be seated in the
housing with the arrow pointing forward, check that the arrow on the flange of
the housing is pointing forward. If this is not the case, the housing needs to be
reinstalled with the correct orientation.
• Is power being supplied to the instrument/processor? The power must be 9 to
16VDC. If there is no voltage, check the wiring.
• NMEA 0183 Speed & Temperature Only: Is the sensor wired to the instrument
correctly?
Inaccurate Speed Readings
• If the speed sensor is ON when the boat is stationary, you may see a speed
readout of a fraction of a knot because of water movement under the hull.
• If the speed reading is consistently the same percentage higher or lower than
the true speed, it may be due to the speed function within the instrument. Refer
to your instrument owner’s manual.
• If speed readings are inaccurate above about 10knots:
• The sensor is installed in turbulent water. The cause may be water intake or
discharge openings, strakes, fittings, hull irregularities upstream of the
sensor, or the shape of the hull in that area. The sensor must be reinstalled in
another location.
• The insert is covered with aquatic growth. See “Servicing the Insert” on page 22.
• Aerated water is flowing under the sensor because the boat is designed to
pull air under the hull. The sensor will not work on this type of boat.
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