JRC JMA-5212-4, User Manual

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3.4 BASIC OPERATIONS
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Caution
3.4.6 Suppress Sea Clutter [AUTO-SEA]
When using the manual sea clutter suppression function
Procedure 1 Control the sea clutter returns on the radar display by turning the
[AUTO-SEA] control until targets can be easily observed.
Turning
[AUTO-SEA] control clockwise suppresses sea clutter returns.
Turning [AUTO-SEA] control counterclockwise intensifies sea clutter returns.
The sea clutter suppression function suppresses sea clutter returns by decreasing the receiving
sensitivity on a short range.
Turning the
[AUTO-SEA] control clockwise heightens the effect of sea clutter suppression.
However, be careful that excessive suppression causes low signal-strength targets such as
buoys and boats to disappear from the radar display.
Using AUTO SEA (automatic sea clutter suppression function)
Sea clutter suppression can be performed in accordance with the level of sea clutter. Use this
function when the clutter level changes with the direction.
Procedure 1 Press the [AUTO-SEA] control.
AUTO SEA is selected, and SEA AUTO is indicated at the lower left of the radar
display. If AUTO SEA is selected, rotating the AUTO RAIN control and AUTO SEA
control can make fine adjustments manually.
Note:
When AUTO SEA is selected, AUTO RAIN is switched to the manual mode.
AUTO SEA and AUTO RAIN cannot be selected at the same time.
Use the AUTO RAIN mode to set both the AUTO SEA and AUTO RAIN to automatic mode
simultaneously.
When using the [AUTO SEA] function, never set the
suppression level too high canceling out all image
noises from the sea surface at close range.
Detection of not only echoes from waves but also
targets such as other ships or dangerous objects will
become inhibited.
When using the [AUTO SEA] function, make sure to
choose the most appropriate image noise suppression
level.