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Display Problems
Thereareseveralmainconditionsorsourcesofpossibleinterferencethatmaycause
problems with the quality of the information displayed on the control head. Look in
the following table for some symptoms of display problems and possible solutions:
Problem Possible Cause
If the power output of your boat’s engine is unregulated,
the control head may be protecting itself using its over-
voltage protection feature. Make sure the input voltage
does not exceed 20 Volts.
The transducer position may need to be adjusted. A mix of
air and water flowing around the transducer (cavitation)
maybeinterferingwiththeinterpretationofsonardata.See
your Installation Guide for suggestions on adjusting the
transducerposition.
Electrical noise from the boat’s engine may be interfering
with sonarreception.SeeFinding the Cause of Noise for
more information.
Sonar readings may be affected if the transducer is not
positioned correctly (i.e. mounted at an angle, not straight
down), or there is some kind of mechanical interference,
eitherbecauseitismountedinsideahullthatistoothickfor
proper sonar transmission, the bond between the
transducer and the hull is not airtight, or because the
transducer is dirty. Check with your Installation Guide for
guidance on re-positioning the transducer, and make sure
the transducer is clean.
Low battery voltage may be affecting the power of signal
transmission.
Electrical noise from the boat’s engine may be
interfering with sonar reception. See Finding the Cause
of Noise for more information.
The control head loses
power at high speeds.
When the boat moves
at higher speeds, the
bottom disappears or
suddenly weakens, or
the display contains
gaps.
There are no fish
detected, even when
you know they are in
the water under the
boat, or sonar
readings seem weak
or faulty.
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