Furuno Ls4100 - Manual (Page 15)

9
1.10 Suppressing
Interference
Interference from other acoustic
equipment operating nearby or other
electronic equipment on your boat may
show itself on the display as shown in
the figure below.
To suppress interference, do the
following:
1. Press the [MENU/ESC] key to open
the main menu.
2. Use ▲ or ▼ to choose NOISE LIMIT
from page 1 of the menu.
3. Press ► to show the options
window.
4. Use ▲ or ▼ to choose the degree of
suppression desired; Off, Low,
Medium, or High (highest).
5. Press the [MENU/ESC] key to close
the menu.
Interference from
other sounder Electrical interference
Forms of interference
Turn the noise limiter off when no
interference exists, otherwise weak
echoes may be missed.
1.11 Suppressing Low
Level Noise
Low intensity “speckles” may appear
over most of screen. This is mainly due
to sediment in the water or noise. These
can be suppressed by adjusting
CLUTTER on the menu. When the
automatic mode is on, clutter is
automatically rejected. To suppress low
level noise in manual sounder operation,
do the following:
1. Press the [MENU/ESC] key to open
the main menu.
2. Use ▲ or ▼ to choose CLUTTER
from page 1 of the menu.
3. Press ► to show the options
window.
4. Use ▲ or ▼ to choose the degree of
suppression desired; 1, 2, 3 ,4, 5 or
6. The higher the number the greater
the suppression.
5. Press the [MENU/ESC] key to close
the menu.
To turn off low-level noise
suppression
, choose Off at step 4 and
then press the [MENU/ESC] key.
Clutter appearance