Selecting Picture Advance Speed; Suppressing Interference; Erasing Weak Echoes - Furuno GP-1610CF Operator's Manual

3.5 Selecting Picture Advance
Speed
When selecting a picture advance speed, keep
in mind that a fast advance speed will expand
the size of the fish school horizontally on the
screen and a slow advance speed will con-
tract it.
1. Press the MENU key.
2. Press the [6] key to display the VIDEO
SOUNDER SETUP menu.
3. Press or to select ADVANCE.
4. Press t or s to select advance speed (a
"fraction") desired, or STOP to suspend
advancement of the picture.
The fractions in the menu denote number
of scan lines produced per transmission.
For example, 1/8 means one scan line is
produced every 8 transmissions.
5. Press the MENU key.
Fast
Figure 3-9 Comparison of picture
advance speeds

3.6 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 3-10.
To suppress interference, do the following:
1. Press the MENU key.
2. Press the [6] key to display the VIDEO
SOUNDER SETUP menu.
3. Press or to select NOISE LM.
3-4
4. Press t or s to select degree of suppres-
5. Press the MENU key.
Figure 3-10 How the noise limiter works
Turn the noise limiter circuit off when no in-
terference exists, otherwise weak echoes may
be missed.
Slow

3.7 Erasing Weak Echoes

Dirty water or reflections from plankton may
be painted on the display in green or light blue.
These weak echoes may be erased as follows:
1. Press the MENU key.
2. Press the [6] key to display the VIDEO
3. Press
4. Press t or s to select level of erasure;
5. Press the MENU key.
sion desired; OFF, NL1, NL2 or NL3. The
higher the number the greater the degree
of suppression.
Electrical
interference
Noise limiter
turned on
SOUNDER SETUP menu.
or to select SIG LEV.
SL0 (OFF), SL1 or SL2. The higher the
number the stronger the echo will be
erased.
Interference from
other sounder