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
Options
>
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
Options
>
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.
Radar Filter Settings
Adjusting Sea Clutter on the Radar Screen
You can adjust the appearance of clutter caused by
choppy sea conditions. The sea clutter setting affects
the appearance of nearby clutter and targets more than
it affects the appearance of distant clutter and targets.
A higher sea clutter setting reduces the appearance of
clutter caused by nearby waves, but it can also reduce or
eliminate the appearance of nearby targets.
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
Options
>
Radar Filters
>
Sea Clutter
.
2
Select an option:.
• Select an
Auto
option based on the sea conditions.
• Select
Up
or
Down
to adjust the appearance of
sea clutter until other targets are clearly visible on
the radar screen. Select a setting that reflects the
present sea conditions.
Clutter caused by sea conditions may still be visible.
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
(
).
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, select
Options
>
Radar Filters
>
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.
Averaging Multiple Scans on the Radar Screen
You can average the results of multiple scans on the
radar screen. This can be an effective method to filter out
noise and enhances the detection of consistent targets.
Averaging is most effective when using a longer range.
1
From a radar screen or the radar overlay, select
Options
>
Radar Filters
>
Scan Average
.
2
Select an option.
The High setting filters out the most noise.
Radar Options Menu
From a radar screen, select
Options
>
Radar Options
.
MotionScope™
: Uses the Doppler effect to detect and
highlight moving targets to help you avoid potential
collisions, find flocks of birds, and track weather
formations (
). This option is only available on Fantom
models.
Pulse Exp.
: Increases the duration of the transmit pulse,
which helps maximize the energy directed toward
targets. This helps to enhance the detection and
identification of targets. This option is only available on
xHD radome and xHD2 open array models.
Target Size
: Adjusts the size of targets, by adjusting the
pulse compression processing. Select smaller targets
for a sharp, high resolution radar image. Select larger
targets to display larger echos for point targets, like
boats and buoys. This option is only available on
Fantom models.
Echo Trails
: Enables you to track the movement of
vessels on the radar screen. This option is not available
on xHD open array or HD/HD+ radome models.
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Radar
