Raymarine C-Series Reference Manual page 115

Chapter 5: Using the Radar
storm cells are usually visible for long distances due to their extreme altitude, you may
wish to leave them displayed so that you can observe the location of bad weather.
Notes: (1) You should use this function in conjunction with the RAIN function to
Rain
Your radar detects echoes from rain or snow. The strength of these echoes is dependent
upon the altitude, range, density and size of the snow flakes or rain droplets and will
appear on screen (see
intensity and position.
Turning the RAIN clutter function on suppresses the bulk effect of rain returns from
around your boat, so that detection of actual targets is made easier
How do I manually adjust 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.
To change the gain manually:
1. Select GAIN and then toggle the GAINoption to MAN. The adjustment slider is
displayed above the soft key.
2. Use the rotary control to adjust the value in the slider. This value takes immediate
effect:
• 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 top color band. All echoes with a
signal strength above this value are displayed in the strongest color. Those
witha 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. You will need to re-adjust the
color gain as conditions change.
• TVG - A low TVG value has little effect on gain in shallow water.; a high value
decreases the gain in shallow water so that only the strongest echoes are
displayed.
3. Press OK or CANCEL twice to return to the default display.
obtain the best picture.
page 5
)as countless small echoes continuously changing size,
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