Chapter 6: The Fishfinder 137
Auto gain settings
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, which are saved
with the preset if power is removed from the system:
• CRUISING (Low) is ideal for viewing fishfinder images with a minimum of
background noise while you cruise to your fishing spot. Only the strongest echoes
are displayed.
• TROLLING (Medium) is a slightly higher gain setting that displays more detail.
• FISHING (High) provides the most detail, but also displays the most background
noise and surface clutter.
To select an auto gain setting
1. Select the PRESENTATION softkey
2. Press the GAIN softkey.
3. Toggle the setting to AUTO.
4. Press OK.
Manually-set gain levels
If necessary you can set gain levels manually. Manually-set gain levels are applied to
the active window and any other fishfinder windows displaying that frequency.
To set the gain level manually
1. Select the PRESENTATION softkey
2. Press the GAIN softkey.
3. Toggle the setting to MAN.
4. Use the slider to set your required gain value.
5. Press OK.
Gain should be set high enough to see fish and bottom detail but without too much
background noise. Generally, high gain is better in deep or clear water; low gain is
better for shallow or murky water. The default setting for manual gain is 75%.
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 a 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.
81244_4.book Page 137 Thursday, January 31, 2008 1:53 PM
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