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TRACKFISH 6600 Installation and Operation Manual40
NAVMAN
d Adjusting range manually
Either press or to increase or
decrease range.
Or press MENU, select Range
and select Manual. Range does
not change.
If the TRACKFISH is in Cruise or Fishing
modes, it will stop adjusting range
automatically but will continue to adjust
gain and threshold automatically.
Manual range is useful in areas of
rapidly changing bottom depth, such as
around pinnacles, to prevent the display
from redrawing often to always show
the bottom.
To revert to automatic range, with the
bottom always displayed:
Either press GOTO/AUTO and select
Cruise or Fishing.
Or press MENU, select Range and
select Auto. If gain and threshold are
manual, they will stay manual.
8-5-2 Using the A-scope to set
gain and threshold manually
It is convenient to use the A-scope display when
adjusting gain and threshold manually. Follow
this procedure to adjust gain and threshold for
normal circumstances:
1 If necessary, select the sonar frequency
to adjust the settings for
(see section 15-3).
2 Select the sonar display (see section 2-6).
If necessary, press
or to adjust
range so that the bottom is displayed.
3 Press MENU, select Sonar splits
then select Split A-scope.
4 Press ENTER to display the Gain
window. To adjust gain or threshold for
a frequency, press
or to select the
setting to adjust, then press or to
change the setting.
5 Set threshold to zero.
6 Adjust Gain so the peak of the strong
signal from the bottom just touches the
gain line.
7 Adjust threshold so that it is just to the
right of the noise.
8 Press ESC to close the gain window.
Threshold
line
Gain line
Unwanted noise signal
Peak of
bottom
signal
9 If required, repeat these steps to
adjust gain and threshold for the other
frequency.
Note: Setting the gain higher will display more
detail from weak echoes, like sh, but will loose
detail from the strong echo from the bottom.
39


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