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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 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.
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 interpretation of sonar data. See
your Installation Guide for suggestions on adjusting 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 an angle, 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, 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.