Garmin GMR 20 - Manual (Page 10)

6 GMR 20/40 Owner’s Manual
GMR 20/40 O
PERATION
> T
HE
R
ADAR
A
DJUSTMENT
M
ENU
continued
To change a Radar Adjustment Menu setting:
1. Press the ADJ key to display the Adjustment Menu.
2. Using the ARROW KEYPAD or DATA ENTRY keys, select
an option. If using the ARROW KEYPAD to highlight an
option, press the ENTER key to display the adjustment for that
selection.
3. Using the ARROW KEYPAD, make the desired change, then
press the ENTER key to accept the change.
Gain
Selecting Gain, displays the Gain Adjustment Slider. When Auto
is selected, the Scanner Gain is automatically adjusted to provide
optimal performance.
To change the Gain setting:
1, Using the ARROW KEYPAD, move the slider up or down.
2. Press the ENTER key to accept the change.
To return the Gain setting to Auto, move the slider to the Auto
position, or press the Auto Soft Key.
Sea Clutter
Sea Clutter is screen clutter caused by choppy sea conditions.
Adjusting the Sea Clutter setting can help eliminate the screen clutter.
Selecting Sea Clutter displays the Sea Clutter Adjustment Slider. The
slider has three preset positions: Calm, Moderate, and Rough.