3 Basic Operation of ECDIS 3-39
ECDIS
(4) Radar image adjustment (on the operation panel)
Note:
• If menu panel adjustment ([(7) Main] - [(9) Radar Overlay] - [(0) Setting] “Rader Option”
panel) is selected, the following dials do not work. In this case, change the menu setting to
activate the dials. For details, see 3.32.1 “Setting Radar Options”.
[VIDEO]: Adjusting the brightness of radar echoes
The [VIDEO] dial adjusts the brightness of radar echoes. Turning the [VIDEO] dial to the right
increases the brightness. Adjust to the best brightness to view radar echoes.
[RAIN]: Suppressing rain and snow clutter
The [RAIN] dial suppresses clutter caused by rain and snow. Turning the [RAIN] dial
(ANTI-CLUTTER RAIN dial) to the right enhances the contours of targets that are hidden in images
of rain and snow.
Take care not to over-adjust this dial. Otherwise, you may miss small targets. This dial also reduces
sea clutter. So, using both the [RAIN] and [SEA] dials is more effective. Normally, keep this dial
turned as far as possible to the left.
[SEA]: Suppressing sea clutter
The [SEA] dial lowers the reception sensitivity in near distances to reduce sea clutter. Turning the
[SEA] dial (ANTI-CLUTTER SEA dial) to the right increases the effect of suppressing sea clutter.
Take care not to over-adjust this dial. Otherwise, you may miss small targets like buoys and small
boats.
[GAIN]: Adjusting sensitivity
The [GAIN] dial adjusts the reception sensitivity of RADAR echo. Turning the [GAIN] dial to the right
increases the reception sensitivity and widens the distances in which RADAR echo can be
observed.
Take care not to over-adjust this dial, as reception noise on screen increases. This worsens the
contrast and makes it more difficult to tell the difference between targets and RADAR echo.
Alternatively, turning the [GAIN] dial to the left to view near distances or screens containing closely
packed targets, decreases the reception sensitivity making targets easier to view.
Take care not to over-adjust this dial. Otherwise, you may miss small targets.
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