Garmin GMR 21 - Manual (Page 10)

6 GMR 21/41 Owner’s Manual
GMR 21/41 O
PERATION
> T
HE
R
ADAR
A
DJUSTMENT
M
ENU
To change a Radar Adjustment Menu setting:
1. Press ADJ/MENU to display the Adjustment Menu.
2. Use the Rocker or Data Entry keys to select an option. Press
ENTER to display the adjustment for that selection.
3. Use the Rocker to change the current setting. Press ENTER
to accept the change.
Gain
Selecting Gain displays the Gain adjustment slider. When Auto
is selected, the scanner’s gain is automatically adjusted to provide
optimal performance. Manually adjusting the gain increases or
decreases the receiver’s sensitivity. Increasing the gain may help to
show a distant target, but may also increase screen clutter.
To change the Gain setting:
1, Use the Rocker to move the slider up or down.
2. Press ENTER 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
Adjusting the Sea Clutter setting can help eliminate any unwanted
screen clutter caused by choppy sea conditions. Selecting Sea Clutter
displays the Sea Clutter adjustment slider. The slider has three preset
positions: Calm, Moderate, and Rough.