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4 GMR 404/406 Owner’s Manual
bAsIc oPerAtIon > rAdAr PAge
Using the Radar Adjustment Menu
Use the Radar adjustment menu to access the settings and features
most commonly used on the Radar Page including: Gain, Sea Clutter,
Rain Clutter, FTC, Zoom, Target Expansion, Trails, Guard Zone,
VRM/EBL, MARPA, and Hide/Show Navigation Features.
To select an adjustment option from the Radar Page
1. Press ADJ/MENU to open the Radar adjustment menu.
2. Press up or down on the ROCKER to highlight the option you
want to change, and then press ENTER.
To change a Radar adjustment menu setting:
1. Select an adjustment menu option using the method described
previously.
2. Press up or down on the ROCKER to change the setting,
range, or percentage.
3. Press ENTER to accept the change, or press QUIT to close
the Radar adjustment menu.
Gain
Gain controls the sensitivity of the Radar receiver. Auto (default)
is the recommended setting. It automatically adjusts the gain to
provide optimal performance. You can also set gain manually. To see
more detail, increase the receiver sensitivity by selecting a higher
gain. If there is too much detail, or the screen is cluttered, lower the
sensitivity (lower the gain) to increase the clarity of the screen.
Sea Clutter
Sea Clutter controls unwanted screen clutter caused by choppy sea
conditions. The slider has three preset positions: Calm, Moderate,
and Rough.
Rain Clutter
Rain Clutter controls unwanted screen clutter caused by rain at close
ranges (use the slider to select 1-100%).