11
1.14 Suppressing Interference
Interference from other acoustic equipment
operating nearby or other electronic equip-
ment on your boat may show itself on the dis-
play as shown in Figure 1-27.
To suppress interference, do the following:
1. Select MENU with the MODE control.
2. Select NOISE LIMITER.
3. Press the [+] or [–] key to select degree of
suppression desired; OFF, NL1, NL2 or
NL3. The higher the number the greater
the degree of suppression.
Interference from Electrical inteference
other sounder
Figure 1-27 Interference
Turn the noise limiter circuit off when no in-
terference exists, otherwise weak echoes may
be missed.
1.15 Suppressing Low Level
Noise
Light-blue dots may appear over most of
screen. This is mainly due to dirty water or
noise. This noise can be suppressed by ad-
justing CLUTTER on the User menu.
When the automatic mode is on, the clutter
suppression setting is fixed at AUTO. To sup-
press low level noise in manual sounder op-
eration do the following:
1. Select MENU with the MODE control.
2. Select CLUTTER.
3. Press the [+] or [–] key to select clutter
rejection level desired. The higher the
number the higher the degree of suppres-
sion. Note that weak echoes may not be
displayed when the clutter circuit is on.
Figure 1-28 Clutter appearance
1.16 Selecting Background and
Echo Colors
1. Select MENU with the MODE control.
2. Select HUE.
3. Press the [+] or [–] key to select hue num-
ber. (You can see the result of your selec-
tion on the display.)
Table 1-2 Background and echo colors
euH
.oN
roloCohcEroloCdnuorgkcaB
1roloc61eulb-muideM
2roloc8eulb-muideM
3roloc61eulb-kraD
4roloc8eulb-kraD
5roloc61etihW
6roloc8etihW
7roloc61kcalB
8roloc8kcalB
9seitisnetni8,emorhconoM
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