JRC JMA-5212-4 Simplified Manual page 7

Using the automatic sea clutter suppression mode
Procedures
1 Press the [AUTO-SEA] dial.
The automatic sea clutter suppression mode is selected, and AUTO
suppression (Sea) mode switching.
2 Make adjustments by turning the [AUTO-SEA] dial.
Even when the automatic sea clutter suppression mode is selected, turning the [AUTO-SEA] dial can
make fine adjustments manually.
Cancellation
1 Press the [AUTO-SEA] dial.
The automatic sea clutter suppression mode is cancelled, and
suppression (Sea) mode field.
MAN is displayed in the sea clutter
S-5
is displayed in sea clutter