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1. OPERATION
1-11
1.10 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 A/C SEA control to
reduce the clutter, either manually or automatically.
Auto mode
1. Press the Menu key to open the menu.
2. Use S or T to select [Echo] and press the ENTER key.
3. Use S or T to select [Sea Mode] and press the ENTER key.
4. Use S or T to select [Auto] or [Manual] and press the ENTER key. The window
for Gain/Sea/Rain indicator appears. (Refer to the illustration of step 4 in
section 1.9). If you selected [Auto], go to step 5. For [Manual], go to "Manual
mode" below.
5. Press the CANCEL/HL OFF key to close the window. [Auto] is used to reduce the
sea clutter automatically. If the sea clutter is strong while cruising along a coast-
line in the [Auto] mode, go to step 6. If not, go to step 9.
6. Use S or T to select [Auto Sea] and press the ENTER key.
7. Use S or T to select [Coastal] or [Advanced] then press the ENTER key. The win-
dow for Gain/Sea/Rain indicator appears for confirmation.
[Coastal]: Suppress both land and sea clutter. For cruising along a coastline.
[Advanced]: Automatically identify land echoes from sea reflections to suppress
only sea reflections. Use this mode for general use.
8. Press the CANCEL/HL OFF key to close the menu.
9. Press the MENU key to close the menu,
Note: When you want to adjust the sea clutter finely in [Auto] mode, rotate the
A/C SEA knob. The confirmation window appears. If you select [Yes], the mode
changes to [Manual] mode. Rotate the A/C SEA knob to adjust the sea clutter.
Confirmation message
Manual mode
1) Rotate the A/C SEA knob to reduce the sea clutter.
Note: When the setting of the A/C SEA control is correct, 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 control until the clutter
has disappeared to leeward, but a small amount of the clutter is visible windward.
Coastal
Advanced
Are you sure to change to manual mode?