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116 C-Series Display Reference Manual
The gain, or sensitivity, of the display adjusts background noise by varying the echo
strength for display. The value of the GAIN control determines the strength above
which echoes are displayed. There are three AUTO GAIN modes:
Low is ideal for viewing fishfinder images with a minimum of background noise as
you are cruising to your fishing spot. Only the strongest echoes are displayed.
Medium is a slightly higher gain set ting that dis plays more deta il ed echoes as you
are trolling. This is the default mode.
High gives the best details of the targets you have located but also displays the
most background noise and surface clutter. This is suitable when you are fishing.
With all of these modes, the DSM will automatically adjust the Gain setting for current
conditions and adjust separately for each frequency. Any adjustments made apply to
all windows using that frequency.
Manually adjusting the gain modes
If necessary you can set the gain controls manually. The new values remain set even
when you switch off the display and are applied to both the active window and any
other fishfinder windows displaying that frequency.
Manual Gain Mode
This should be set high enough to see fish and bottom detail but without too much
background noise. Generally, a high gain is used in deep and/or clear water; a low gain
in shallow and/or murky water.
Color Gain
This sets the lower limit for the strongest echo color. All echoes with a signal strength
above this value are displayed in the strongest color. Those with a weaker value are
divided equally between the remaining colors. Setting a low value produces wide band
for the weakest color, but a small signal band for the other colors; setting a high value
gives a wide band for the strongest color, but a small signal band for the other colors.
D7548-2
FISHFINDER
SETTINGS...
GAIN...
GAIN MODE
100
GAIN MODE
adjust setting
Press to highlight
soft key
Toggle to manual and
MA
N
AU
T
O
FISHFINDER
SETTINGS...
D7358-2
COLOR GAIN
GAIN...
100
COLOR GAIN
adjust setting
Press to highlight
soft key
Toggle to manual and
MA
N
AUTO
81221_5.book Page 116 Thursday, October 11, 2007 12:47 PM
132


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