Application Example - Furuno CH-37 Operator's Manual

2.20 Application Example

Sonar (Horizontal) Mode
PURSE SEINING
1 Power ON.
PWR
TRANSDUCER
O
-
MODE RANGE
BOTTOM TRAWLING
1 Power ON.
PWR
TRANSDUCER
O
-
MODE RANGE
For bottom trawling, sonar is usually used to detect net hangs ahead
rather than to detect fish close to the bottom, since bottom returns
usually mask the weaker fish targets close to the bottom. If the fish
school is dense enough and off the bottom they can be detected by
sonar.
2-26
The figure below shows a typical sonar mode application.
2 Lower soundome.
PWR
O
+
After blinking, remains lit.
2 Lower soundome.
PWR
O
+
After blinking, remains lit.
3 Search for fish school
PWR
O I
TRANSDUCER
+
-
3 Observe bottom on the
TRANSDUCER
+
-
Select the proper range and
tilt angle.
with RANGE and TILT
controls.
TRANSDUCER
+
-
MODE RANGE
4 6
8
2
0
10
TRAIN GAIN
GAIN : "3~5"
NOISE LIMITER : "2~4"
TVG(level & time) : "3~5"
TX POWER : C
Use these settings initially.
"Fine tune" as necessary.
screen.
Bottom
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