How To Reduce The Rain Clutter - Furuno 1815 Operator's Manual

2. OPERATION
3. Select [Auto SEA], then press the ENTER key.
4. Select [Coastal] or [Advanced] then press the ENTER key. The
window for GAIN/SEA/RAIN indicator appears for confirmation.
[Advanced]: Discriminate land echoes from sea reflections to
suppress only sea reflections. The degree of sea clutter reduction is smaller than
[Coastal]. Use this mode for general use.
[Coastal]: Suppress both land and sea clutter. Useful when cruising along a
coastline.
5. Press the MENU/ESC key to close the window.
6. Press the MENU/ESC key to close the menu.
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How to Reduce the Rain Clutter

The reflections from the rain or snow appear on the screen. These reflections have the
name "rain clutter". When the rain clutter is strong, targets in the rain clutter are hidden
in the clutter. Reflections from the rain clutter are easily identified from true targets by
their wool-like appearance.
The rain clutter function works like the sea clutter function, adjusting the receiver sen-
sitivity, but in longer range. If the setting is high, the rain clutter is more reduced. The
rain control breaks the continuous display of rain or snow reflections into a random
pattern. When the rain clutter hides the targets, adjust the rain clutter (automatic or
manual) to reduce the clutter.
How to select the rain clutter adjustment method
1. Push the RANGE knob to show the [GAIN/SEA/RAIN] window. (This window clos-
es if there is no operation within 10 seconds.)
2. Select [RAIN]. Press the ENTER key to show [RAIN AUTO] or [RAIN MAN] as re-
quired. For manual adjustment, see the section below.
3. Press the MENU/ESC key to close the window.
Manual adjustment of rain clutter
1. Rotate the RANGE knob (or use 
or  on the Cursorpad) to adjust the
rain clutter.
2. Press the MENU/ESC key to close
the window.
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AUTO: Automatic, MAN: Manual
RAIN setting bar
Rain clutter near RAIN control adjusted;
center of screen rain clutter reduced