How To Reduce Sea Clutter - Furuno MFD12 Operator's Manual

6.3

How to Reduce Sea Clutter

The reflected echoes from waves appear at the central part of the display and have
the name "sea clutter". The sea clutter increases in width as the height of waves and
the height of the antenna above the water increase. If the sea clutter is strong, targets
can be hidden inside the clutter, like in the left-hand figure shown below.
When the sea clutter hides targets, adjust the Sea control (automatically or manually)
to reduce the clutter. After the sea clutter is gone, turn off the Sea control to prevent
the loss of targets.
For automatic sea clutter suppression, there are two methods: Advanced and Coastal.
Advanced provides for standard suppression of sea clutter and is intended for normal
use. Coastal suppresses sea clutter further than does Advanced and paints land and
target echoes thicker. Use coastal when you are cruising along a coastline. To select
an automatic sea clutter suppression method, long-push the RotoKey to select [Auto
Sea] followed by [Advanced] or [Coastal].
Automatic sea clutter adjustment
1. Press the GAIN/TX key to show the Gain-Sea-Rain adjustment window. (You can
also show the window if you put the cursor near the site of the window.)
2. Press the GAIN/TX key again to select [Sea].
The Sea "A" icon is green when the automatic Sea is active.
Note: The Gain-Sea-Rain pop-up allows you to switch between automatic and manual
sea clutter adjustment as shown in the procedure which follows.
1. Show the Gain-Sea-Rain adjustment window.
2. Push the right-click button to show the Gain-Sea-Rain pop-up menu.
3. Rotate the RotoKey to select [Auto Sea] then push the key to activate or deacti-
vate the Auto Sea.
Sea clutter at Sea control adjusted;
screen center sea clutter suppressed
6. Radar
6-3