23. Radar Overlay
23-4
23.4 How to Adjust the Radar Overlay (Radar
Overlay dialog box)
The Radar Overlay dialog box has controls for adjustment of the radar image - gain, sea clutter, rain clutter,
interference rejector, echo stretch, and echo average.
Note 1: Sea clutter and rain clutter controls are not
available in the Radar Overlay dialog box if the radar
video is received through LAN from FAR-2x07 radars.
Sea clutter and rain clutter are controlled on the TT
display that controls the transmitter.
Note 2: Gain, sea clutter and rain clutter are independent
from the same controls of any radar display. Therefore,
their optimum position may be different from those on
the radar display.
Note 3: If the ECDIS fails to receive heading, trigger or
azimuth signal from the radar transceiver, it is indicated
in the Radar Overly dialog box. In the right-hand figure
the indication "No Headline" is displayed, indicating no
heading signal.
(for LAN radar overlay) (for radar overlay card)
23.4.1 Radar overlay source
Indicates source of current radar overlay.
23.4.2 Gain
The Gain control is used to set the sensitivity of the radar echo image. When you adjust the gain, "Noise" is
automatically switched ON in order to display low-level radar images.
Note: After adjusting the gain, check and readjust the sea clutter because these two controls affect one another.
23.4.3 Sea clutter
The sea clutter control removes sea clutter from the radar echo image. When you adjust the sea clutter, "Noise" is
automatically switched ON in order to display low-level radar images. If you have radar overlay video through LAN
from FAR-2x07 radar, use the sea clutter control on the radar.
Note: After adjusting the sea clutter, check and readjust the gain because these two controls affect one another.
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