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Actually, the sound waves are usually reflected by the air sac near the
center of the fish, and not by the body of the fish. The size of this air sac
is different for different kinds of fish. This can also affect the size of the
fish symbols on the display. A fish with a large air sac will produce a large
fish symbol, while a fish with a small sac will produce a small symbol.
The symbol also indicates which of the two frequencies was used to locate
the fish. If the fish was spotted by the wide 50 kHz beam, the symbol will
appear to be hollow. If the fish was detected by the narrow 200 kHz
beam, the symbol will be solid.
If the fish symbol feature is turned off, the FishFinder indicates fish in a
different way. See Fig. 3-5. An arch-shaped mark on the display usually
indicates a fish. Again, a larger arch usually indicates a larger fish.
Several arches together show a school of fish.
The return from a fish will have a different appearance, depending on the
frequency used. If a fish is spotted by the wide 50 kHZ beam, the arch will
An arch-shaped image indicates a fish.
The same fish appears differently
when shown by the 50 kHz or 200 kHz
50 kHz
transducer beams.
200 kHz
This indicates a group of small fish.
This shows a fish detected in
sidelooker mode.
A shallow arch or horizontal line is
generated when the boat is moving
slowly or stopped.
When the boat is moving very fast,
a fish appears as a single vertical line.
34
Fig. 3-5
Fish
Indications
Operating Instructions
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