Furuno FR-8122 EU - Manual (Page 24)

1. OPERATIONAL OVERVIEW
1-13
1.11 Suppressing Sea Clutter
Echoes from waves cover the central part of the display with random signals known as sea clutter.
The higher the waves, and the higher the antenna above the water, the further the clutter will
extend. When sea clutter masks the picture, use the A/C SEA control to suppress the clutter,
either manually or automatically.
1.11.1 Choosing sea clutter adjustment method
Push the A/C SEA control to choose automatic or manual adjustment alternately. The adjustment
method currently chosen is show at the top right corner of the screen. In the example below the
sea clutter adjustment method is “AUTO”.
A/C SEA indicator
1.11.2 Setting automatic sea clutter suppression level
1. Press the MENU key to open the menu.
2. Choose the Echo menu and press the ENTER key.
3. Choose Auto Sea and press the ENTER key.
4. Choose the option which best matches current sea condition and press the ENTER key.
5. Press the MENU key to close the menu. Sea clutter is automatically adjusted according to the
level selected.
TUNE AUTO
GAIN AUTO
SEA AUTO
RAIN AUTO
A/C SEA adjustment method (AUTO)
Rough
Moderate
Calm