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Display Problems
There are several main conditions or sources of possible interference that may cause
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
The controlheadlosespowerat
high speeds.
Whentheboatmovesathigher
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.
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) may be interfering with the inter-
pretation of sonar data. See your Installation Guide
for suggestions onadjusting the transducer position.
Electrical noise from the boat’s engine may be
interfering with sonar reception. See Finding the
Cause of Noise for more information.
Sonar readings may be affected if the transducer is
not positioned correctly (i.e. mounted at anangle, not
straight down), or there is some kind of mechanical
interference, either because it is mounted inside a
hull that is too thick for proper sonar transmission,
the bond between the transducer and the hull is not
airtight,orbecausethetransducer isdirty.Checkwith
yourInstallation Guideforguidance on re-positioning
the transducer, andmake sure thetransduceris 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.