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TRACKFISH 6600 Installation and Operation Manual 43
NAVMAN
9-5 Sonar A-Scope display
The display shows the sonar history on the
left and the A-Scope display on the right. The
A-Scope shows:
the strengths of echoes from different
depths - the longer the horizontal line the
stronger the signal
a vertical line showing the gain threshold,
9-4 Sonar 50/200 display
The display shows the 50 kHz sonar history on
the left and the 200 kHz sonar history on the
right. Gain can be set independently for each
frequency (see section 8-5). Range applies to
both frequencies (see section 8-6).
200 kHz
sonar history
50 kHz
sonar history
the weakest echo to display on the sonar
history
a vertical line showing the gain setting;
echoes above this strength will display as
the maximum signal strength
Use the A-Scope while adjusting the gain and
threshold settings manually (see section 8-5).
Fish recognition
The echo strengths shown on the A-scope
can be useful in recognising the type of sh.
Different species of sh have different sizes
and shapes of swim bladders. The air in the
swim bladder re ects the ultrasonic pulse, so
the strength of the echo varies between sh
species according to the size and shape of the
swim bladder.
When catching sh from a school, note the
species and the strength of the echo that
it returns on the A-scope. Then, when that
particular echo is seen again, it is likely to be
the same sh species.
Bottom type
The shape of the echo strengths in the A-Scope
can help you to recognise the type of bottom.
Threshold
line
Gain line
Unwanted
noise
signal
Peak of
bottom
signal
A-scope display
Sonar history
42


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