80 A-Series display - User reference manual
6.6 Presentation options
The PRESENTATION softkey gives you access to VRM features
(for measuring depth and distance), frequency view selection and a
scroll control. These settings affect the monitor you are working on.
Gain and power
The gain settings alter the way the fishfinder processes background
noise (also called clutter). Use of these settings can improve the
fishfinder readout.
For optimum performance, use the auto settings.
Gain settings
To adjust gain settings:
1. Press the PRESENTATION softkey.
2. Press the GAIN softkey
3. Select from the appropriate options on the toolbar.
You can adjust the following aspects of the gain:
• Gain
• Color Gain
• TVG
• Color Threshold
Gain
The gain adjusts the return threshold, above which the fishfinder will
show an object on the screen
Auto Settings:
• Low (the default setting)
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.
• Medium is a slightly higher gain setting that displays more
detail.
• High provides the most detail, but also displays the most back-
ground noise and surface clutter.
Manual setting:
• Use the slider to set your required gain value.
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 sig-
nal band for the other colors.
