Reducing Low Level Noise - Furuno 1823C-BB Operator's Manual

4. VIDEO SOUNDER OPERATION
4.7

Reducing Low Level Noise

Light-blue dots may appear over most of the screen. This is mainly due to
sediment in the water, or noise. This noise can be suppressed by adjusting
CLUTTER on the SOUNDER SETUP menu.
When the automatic sounder mode is used, clutter is automatically adjusted. To
reduce low level noise in manual sounder operation do the following:
1. Press the [MENU] key.
2. Press the A:SOUNDER MENU soft key.
3. Select CLUTTER, then press the A:EDIT soft key to show the clutter window.
4. Adjust the trackball upward or downward to select clutter rejection level
desired; 0 (OFF) through 16. The higher the number the higher the degree of
suppression. Note that the clutter suppressor may erase weak echoes.
Therefore, turn off the clutter when its use is not required.
5. Press the E:RETURN soft key followed by the [MENU] key to close the
menu.
Note: Unlike the signal level feature, clutter does not reduce display colors.
However, if you do not wish to change the relation between weak and
strong echoes, use signal level instead.
4-14
Appearance of clutter
CLUTTER
09
Clutter window
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