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 inter-pretation 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.
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