JRC JMR-7230-S - Radar Image Adjustment

8-59 Section 8 Functions of the ECDIS (Option)
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8.13.4 Radar image adjustment
Radar images can be adjusted using the [RAIN], [SEA] and [GAIN] dials on the keyboard operation
unit.
[RAIN] dial: Suppressing rain and snow clutter
The [RAIN] dial suppresses clutter caused by rain and snow. Turning the [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] dial: Suppressing sea clutter
The [SEA] dial lowers the gain at a short range to reduce sea clutter. Turning the [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] dial: Adjusting sensitivity
The [GAIN] dial adjusts the gain of RADAR echo. Turning the [GAIN] dial to the right increases the gain
and widens the range 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 at a short range or screens containing closely
packed targets, decreases the gain making targets easier to view. Take care not to over-adjust this dial.
Otherwise, you may miss small targets.
Memo
If the keyboard operation unit is not available, the radar image can be adjusted using [Rain], [Sea]
or [Gain] slider in the setting dialog of [Settings]- [Signal Process (Basic)] on the menu.
The [Signal Process (Basic)] setting dialog can also be displayed by operating the [RAIN], [SEA],
or [GAIN] dials on the keyboard operation unit.
When one of the dials is held down (for 2 seconds or more) at operation termination, the setting
dialog is closed.
For the details of the [Signal Process(Basic)] setting dialog, refer to "18.2 Basic setting of radar
signal processing".