2
Select an applicable option for the connected radar:
• To set the gain automatically once, based on average
conditions, the range of the radar signal, and the selected
radar mode, select
Auto
.
The chartplotter does not adjust the gain automatically in
response to changing conditions.
• To adjust the gain automatically for changing conditions,
select
Auto Low
or
Auto High
.
• To adjust the gain automatically to show birds over the
surface of the water, select
Auto Bird
.
Adjusting Gain on the Radar Screen Manually
For optimal radar performance, you can manually adjust the
gain.
NOTE:
Depending upon the radar in use, the gain setting
configured for use in one radar mode may or may not be applied
to other radar modes or to the Radar overlay.
1
From a Radar screen or the Radar overlay, select
Menu
>
Radar Menu
>
Gain
.
2
Select
Up
to raise the gain, until light speckles appear across
the Radar screen.
Data on the Radar screen is refreshed every few seconds. As
a result, the effects of manually adjusting the gain may not
appear instantly. Adjust the gain slowly.
3
Select
Down
to lower the gain until the speckles disappear.
4
If boats, land, or other targets are within range, select
Down
to lower the gain until the targets begin to blink.
5
Select
Up
to raise the gain until the boats, land, or other
targets appear steadily lit on the Radar screen.
6
Minimize the appearance of nearby large objects, if
necessary.
7
Minimize the appearance of side-lobe echoes, if necessary.
Minimizing Nearby Large-Object Interference
Nearby targets of significant size, such as jetty walls, can cause
a very bright image of the target to appear on the Radar screen.
This image can obscure smaller targets located near it.
NOTE:
Depending upon the radar in use, the gain setting
configured for use in one radar mode may or may not be applied
to other radar modes or to the Radar overlay.
1
From a Radar screen or the Radar overlay, select
Menu
>
Radar Menu
>
Gain
.
2
Select
Down
to lower the gain until the smaller targets are
clearly visible on the Radar screen.
Reducing the gain to eliminate nearby large-object
interference may cause smaller or distant targets to blink or
disappear from the Radar screen.
Minimizing Side-Lobe Interference on the Radar Screen
Side-lobe interference may appear to streak outward from a
target in a semi-circular pattern. Side-lobe effects can be
avoided by reducing the gain or reducing the radar range.
NOTE:
Depending upon the radar in use, the gain setting
configured for use in one radar mode may or may not be applied
to other radar modes or to the Radar overlay.
1
From a Radar screen or the Radar overlay, select
Menu
>
Radar Menu
>
Gain
.
2
Select
Down
to lower the gain until the semi-circular,
streaked pattern disappears from the Radar screen.
Reducing the gain to eliminate side-lobe interference may
cause smaller or distant targets to blink or disappear from the
Radar screen.
Adjusting Sea Clutter on the Radar Screen Automatically
You can set the chartplotter to automatically adjust the
appearance of clutter caused by choppy sea conditions.
NOTE:
Depending upon the radar in use, the sea clutter setting
configured for use in one radar mode may or may not be applied
to other radar modes or to the radar overlay.
NOTE:
Not all options and settings are available on all radar and
chartplotter models.
1
From a radar screen or the radar overlay, select
Menu
>
Radar Menu
>
Noise Rejection
>
Sea Clutter
.
2
Select
Presets
or
Auto
.
3
Select a setting that reflects the present sea conditions.
When using a compatible radar model, the chartplotter adjusts
the sea clutter based on the sea conditions automatically.
Adjusting Rain Clutter on the Radar Screen
You can adjust the appearance of clutter caused by rain.
Reducing the radar range also can minimize rain clutter
Zooming In and Out of the Radar Screen
The rain clutter setting affects the appearance of nearby rain
clutter and targets more than it affects the appearance of distant
rain clutter and targets. A higher rain clutter setting reduces the
appearance of clutter caused by nearby rain, but it can also
reduce or eliminate the appearance of nearby targets.
NOTE:
Depending upon the radar in use, the rain clutter settings
configured for use in one radar mode may or may not be applied
to other radar modes or to the Radar overlay.
1
From a Radar screen or the Radar overlay, select
Menu
>
Radar Menu
>
Noise Rejection
>
Rain Clutter
.
2
Select
Up
or
Down
to decrease or increase the appearance
of nearby rain clutter until other targets are clearly visible on
the Radar screen.
Clutter caused by rain may still be visible.
Reducing Cross Talk Clutter on the Radar Screen
You can reduce the appearance of clutter caused by
interference from another nearby radar source, when the cross
talk reject setting is on.
NOTE:
Depending upon the radar in use, the cross talk reject
setting configured for use in one radar mode may or may not be
applied to other radar modes or to the Radar overlay.
From a Radar screen or the Radar overlay, select
Menu
>
Radar Menu
>
Noise Rejection
>
Crosstalk Rej.
.
Echo Trails
The echo trails feature enables you to track the movement of
vessels on the radar display. You can change the length of time
the trail is displayed.
NOTE:
Depending upon the radar in use, the settings configured
for use in one radar mode may or may not be applied to other
radar modes or to the radar overlay.
NOTE:
Not all options and settings are available on all radar and
chartplotter models.
Turning on Echo Trails
From a radar screen or the radar overlay, select
Menu
>
Radar Menu
>
Radar Setup
>
Echo Trails
>
Display
.
Adjusting the Length of the Echo Trails
1
From a radar screen or the radar overlay, select
Menu
>
Radar Menu
>
Radar Setup
>
Echo Trails
>
Time
.
2
Select the length of the trail.
Clearing the Echo Trails
You can remove the echo trails from the radar screen to reduce
the clutter the screen.
From a radar screen or the radar overlay, select
Clear Trails
.
Radar Display Settings
From any Radar screen or the Radar overlay, select
Menu
>
Radar Menu
>
Radar Setup
.
22
Radar
CONFIDENTIAL