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Using the radar | NSS Operator Manual
Optimizing the radar image
You may be able to improve the radar image by
adjusting the radar sensitivity, and by fi ltering
out the random echoes from sea and weather
conditions.
You select between the control images by
tapping the image or by pressing the rotary
knob. Active control will expand and display
its name in full. You can then adjust the value
by turning the knob or by a vertical dragging
movement on the control you want to adjust.
Gain
The gain controls the sensitivity of the radar receiver.
A higher gain makes the radar more sensitive to radar returns, allowing it to display weaker
targets. If the gain is set too high, the image might be cluttered with background noise.
Gain has a manual and an automatic mode. You cycle through the modes by pressing and
holding the rotary knob. You can only adjust the gain value in manual mode by turning the
rotary knob or vertical dragging movement over the gain control.
Sea clutter
Sea clutter is used to fi lter the eff ect of random echo returns from waves or rough water near
the vessel.
When you increase Sea Clutter fi ltering the on-screen clutter caused by the echoes of waves
will be reduced.
A long-press on the rotary knob will cycle through available Sea clutter modes. You can only
adjust the sea clutter value in manual mode by turning the rotary knob or vertical dragging
movement over the sea clutter control.
Rain Clutter
The Rain clutter is used to reduce the eff ect of rain, snow or other weather conditions on the
radar image.
Adjust value by turning the rotary knob or vertical dragging movement over the rain clutter
control.
The value should not be increased too much as this may fi lter out real targets.
Rejecting radar interference
Interference could be caused by radar signals from other radar units operating in the same
frequency band.
A high setting will reduce the interference from other radars.
In order to not miss weak targets, the interference rejection should be set low when no
interference exists.
Positioning the radar center
You can move the radar PPI center to diff erent positions within the radar panel, and select
how your vessel symbol moves on the radar image.
Radar motion is indicated on the upper left corner of the radar panel as either
TM (True motion) or RM (Relative motion).
The radar position can only be changed when the radar is transmitting.
Center
Default setting. The radar PPI center is centered on the radar panel.
Look Ahead
Moves the radar PPI center to the bottom of the panel to give maximum view ahead.
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