How To Reduce The Sea Clutter - Furuno 1835 Operator's Manual

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.
1. Press the MENU 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 [Sea Mode] and press the ENTER key.
4. Use the Cursorpad ( or ) to select [Auto] or [Manual] then press the ENTER
key. The window for Gain/Sea/Rain indicator appears (refer to the illustration at
step 4 in section 1.9). If you selected [Auto], go to step 5. For [Manual], go to Man-
ual mode below.
5. Press the CANCEL/HL OFF key to close the window. [Auto] is for reducing 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 the Cursorpad ( or ) to select [Auto Sea] and press the ENTER key.
7. 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.
8. Press the CANCEL/HL OFF key to close the window.
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 message appears. If you select [Yes], the mode changes
to [Manual] mode. Rotate the A/C SEA knob to adjust the sea clutter.
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, tar-
gets are hidden in the clutter. If the setting is higher than necessary, both sea clut-
ter 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.
Auto Sea options
Are you sure to change to manual mode?
Confirmation message
1. DESCRIPTION OF OPERATION
1-11