Garmin GMR 21 - Manual (Page 11)

GMR 21/41 Owner’s Manual 7
GMR 21/41 O
PERATION
> T
HE
R
ADAR
A
DJUSTMENT
M
ENU
To change the Sea Clutter setting:
1. Use the Rocker to move the slider to a preset or other
position.
2. Press ENTER to accept the change.
The preset positions can also be selected using the soft key options.
Rain Clutter
Adjusting the Rain Clutter setting can help remove screen clutter
caused by rain at close ranges. Selecting Rain Clutter displays the
Rain Clutter adjustment slider.
To change the Rain Clutter setting:
1. Use the Rocker to move the slider to the desired setting.
2. Press ENTER to accept the change.
FTC (Fast Time Constant)
Adjusting the Fast Time Constant can help eliminate distant screen
clutter caused by rain. The Fast Time Constant has four presets: Off,
Low, Medium, and High.
To change the FTC setting:
1. Use the Rocker to select a new setting.
2. Press ENTER to accept the change.
The FTC settings can also be selected using the soft key options.
FTC Menu