Radar: Rain clutter adjustment
Rain clutter is visual noise on the Radar screen created by
interference from rain, hail or snow.
The rain clutter adjustment is a combination of the FTC (Fast Time
Constant) that defines the leading edge of a rain shower but
suppresses echoes from the following body of rain, so that any
targets in the rain shower area are shown more clearly; and the
STC (Sensitivity Time Control) that helps to suppress echoes from
any rain around the radar itself.
If the rain adjustment is too low, there'll be excessive rain clutter
displayed whenever it's raining. If the rain adjustment is too high,
very large targets such as the coastline will appear to be hollow.
The rain setting is shown as a percentage. 0% is the default.
Note: The rain setting is returned to the default value of 0%
every time the
Radar is restarted.
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To change the rain clutter adjustment:
• Display the Radar screen and main menu. If you can't see the
Adjust Radar button, select Return.
• Select
Adjust Radar.
• Select
Rain and a slider box appears. The current setting is
shown as a line within a solid bar of color and as a percentage.
• Drag the line to change the setting.
• Select
OK.
Radar: Reduce interference
If another vessel's radar is operating at the same frequency as
your radar it can cause interference patterns on your
Radar
screen.
Interference patterns always appear in a different place with each
sweep. They can be randomly scattered bright dots or dotted lines
that extend from the centre to the edge of your
Radar screen,
often producing a spiral pattern. The stronger the interference, the
wider the interference lines.
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To reduce interference:
• Display the Radar screen and main menu. If you can't see the
Presentation button, select Return.
• Select
Presentation then Interference Rejection. An
option list appears:
◦ Off. Turn interference rejection Off.
Radar |113
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