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Bottom or fish school is
not displayed well.
Many noise appears on
the display.
As the reflected echoes are very weak at the below described place, the image low
sensitivity may be shown.
But it is not trouble.
where there are
many sludge.
where there are
many sea weeds.
where there are
many mud or
rubbish.
where the water is
whirled by rapid
current.
Too low sensitivity.
Weeds, barnacles, oyster shell, rubbish
or etc. attach on the surface of
transducer.
Install it inside the hull, bottom or liquid is
dirty.
Increase the sensitivity.
Or set Auto Gain.
Remove the attachment well.
Remove the stain on the bottom. Replace the
liquid.
Too high sensitivity.
Interference with other boat's fish finder.
Noise from engine.
Decrease the sensitivity.
Or set Auto Gain.
Noise disappears if the adequate distance
between own boat and other keeps.
Change the routing of cables like transducer
cable, power supply cable or etc. (Separate
from engine as far as possible.)
Symptoms
Causes
Remedy
