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Auto Gain
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:
• LO is ideal for viewing images with a minimum of background noise as you
are cruising to your fishing spot. Only the strongest echoes are displayed.
• MED is a slightly higher gain setting that displays more detailed echoes as you
are trolling. This is the default mode.
• HI 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 fish-
ing.
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.
The default is HI.
Color Gain
Color gain determines how echoes of different strengths are displayed. As
conditions change the color gain adjusts accordingly.
The default is AUTO.
TVG (Time Variable Gain)
The TVG (Time Variable Gain) reduces the clutter by varying the gain throughout
the water column. This function is useful for reducing the appearance of 'noise'.
Increasing the TVG value increases the maximum depth to which TVG is applied.
Decreasing it reduces the maximum depth. TVG has no effect in fishfinder
Simulator Mode.
The default is AUTO.
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.
1. Select FISHFINDER SETTINGS and then GAIN.
2. Toggle the required mode to MAN. The adjustment slider is displayed above
the appropriate soft key.
DSM25 Owner's Handbook
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