Obtaining Optimal Radar Display Performance; Adjusting The Vrm And Ebl - Garmin GPSMAP 4212 Owner's Manual

Using Radar

Obtaining Optimal Radar Display Performance

The gain controls the sensitivity of the radar receiver. The default setting for the gain is Auto; this
setting adjusts the gain automatically to provide the best performance.
To adjust the gain:
1. From the Radar screen, select
2. Select an option to adjust the gain:
• To return the gain to the default setting, select Auto.
• To manually adjust the gain, select
Reducing Unwanted Noise
There are several options that adjust the gain to help reduce unwanted clutter on the Radar screen.
1. From the Radar screen, select
2. Select an option:
• Select Rain Cltr to adjust the gain for unwanted clutter caused by rain at close ranges. Select
Up or Down to adjust the rain clutter sensitivity.
• Select Sea Cltr to adjust the gain for clutter caused by choppy sea conditions. Select Rough,
Medium, or Calm. Select
• Select Cross Talk
proximity.
• Select FTC (Fast Time Constant) to reduce unwanted clutter caused by rain at a distance.
FTC has four presets: Off, Low, Medium, or High.

Adjusting the VRM and EBL

The Variable Range Marker (VRM) and Electronic Bearing Line (EBL) tools measure range and
bearing to a target. You can adjust the diameter of the VRM and the angle of the EBL.
To show or hide the VRM and EBL:
The measured range and bearing are displayed in the upper-left corner of the screen.
• If the VRM and EBL are hidden, from the Radar screen, select
• If the VRM and EBL are shown, from the Radar screen, select
Hide VRM/EBL.
To select the VRM/EBL target location:
1. On the Radar screen, use the
VRM/EBL marker.
2. Select Drop VRM/EBL.
To adjust the VRM/EBL target location:
1. From the Radar screen, select
2. Use the Rocker to move the pointer to a new location for the marker.
3. Select Done.
48
Menu > Gain.
Up or Down.
Menu Noise
>
Up Down
or to manually adjust the sea clutter sensitivity.
to filter out interference caused by another radar operating in close
Rocker to move the pointer to the location you want to set the
Menu Adjust VRM/EBL
>
Rejection.
Menu
Menu
Move VRM/EBL.
>
GPSMAP 4000 Series Owner's Manual
> Show VRM/EBL.
Adjust VRM/EBL
> >