5. OPERATION
5-11
5.10 How to Reduce the Sea Clutter
The reflected echoes from the waves appear around your ship and have the name
"sea clutter". The sea clutter extends according to the height of waves and antenna
above the water. When the sea clutter hides the targets, use the sea clutter function
to reduce the clutter, either manually or automatically.
How to select sea clutter adjustment type
1. Press the MENU/ESC key to open the menu.
2. Use the Cursorpad ( or ) to select [Echo] and press the ENTER key.
3. Use the Cursorpad ( or ) to select [Auto Sea] and press the ENTER key.
Auto Sea options
4. Use the Cursorpad ( or ) to select [Coastal] or [Advanced] then press the EN-
TER key. The window for Gain/Sea/Rain indicator appears for confirmation.
[Coastal]: Suppress both land and sea clutter. For cruising along a coastline.
[Advanced]: Automatically discriminate land echoes from sea reflections to sup-
press only sea reflections. Use this mode for general use.
5. Press the MENU/ESC key to close the window.
6. Press the MENU/ESC key to close the menu.
How to select the sea clutter adjustment method
1. Press the RANGE knob to show the [GAIN/SEA/RAIN] window.
GAIN/RAIN/SEA window
2. Use the Cursorpad to select [SEA]. Press the ENTER key to show [SEA AUTO]
or [SEA MAN] as required. For manual adjustment, see the section below.
3. Press the MENU/ESC key to close the window.
Manual adjustment of sea clutter
1. Rotate the RANGE knob (or use or on the Cursorpad) to adjust the sea clut-
ter.
Note: When the sea clutter is properly adjusted, the clutter is broken into small
dots, and small targets become identified. If the setting is not enough, targets are
hidden in the clutter. If the setting is higher than necessary, both sea clutter and
targets disappear from the display. Normally adjust the knob until the clutter has
disappeared to leeward, but a small amount of the clutter is visible windward.
SEA setting bar
AUTO: Automatic, MAN: Manual
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