Garmin GPSMAP 4210 Owner's Manual - Page 52

Obtaining Optimal Radar Display Performance, Adjusting the VRM and EBL

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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 Menu > Gain. 2. Select an option to adjust the gain: • To return the gain to the default setting, select Auto. • To manually adjust the gain, select Up or Down. 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 Menu > Noise Rejection. 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 Up or Down to manually adjust the sea clutter sensitivity. • Select Cross Talk to filter out interference caused by another radar operating in close 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 Menu > Show VRM/EBL. • If the VRM and EBL are shown, from the Radar screen, select Menu > Adjust VRM/EBL > Hide VRM/EBL. To select the VRM/EBL target location: 1. On the Radar screen, use the Rocker to move the pointer to the location you want to set the VRM/EBL marker. 2. Select Drop VRM/EBL. To adjust the VRM/EBL target location: 1. From the Radar screen, select Menu > Adjust VRM/EBL > Move VRM/EBL. 2. Use the Rocker to move the pointer to a new location for the marker. 3. Select Done. Using Radar 48 GPSMAP 4000 Series Owner's Manual

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48
GPSMAP 4000 Series Owner’s Manual
Using Radar
U
SING
R
ADAR
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
Menu
>
Gain
.
2. Select an option to adjust the gain:
To return the gain to the default setting, select
Auto
.
To manually adjust the gain, select
Up
or
Down
.
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
Menu
>
Noise Rejection
.
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
Up
or
Down
to manually adjust the sea clutter sensitivity.
Select
Cross Talk
to filter out interference caused by another radar operating in close
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
Menu
>
Show VRM/EBL
.
If the VRM and EBL are shown, from the Radar screen, select
Menu
>
Adjust VRM/EBL
>
Hide
VRM/EBL
.
To select the VRM/EBL target location:
1. On the Radar screen, use the
Rocker
to move the pointer to the location you want to set the
VRM/EBL marker.
2. Select
Drop VRM/EBL
.
To adjust the VRM/EBL target location:
1. From the Radar screen, select
Menu
>
Adjust VRM/EBL
>
Move VRM/EBL
.
2. Use the
Rocker
to move the pointer to a new location for the marker.
3. Select
Done
.
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