Furuno CH-37 - Manual (Page 57)

3-13
3.12 How to Use the Vertical Fan Mode
[1] TRAWLER (Surface/Mid-water/Bottom)
Usage Fish school detection
Bottom shape discrimination
Relation between fish school and fishing gear
Auto train
1 Turn on the AUTO TRAIN key on the sub panel 2 and set the
direction of the train center to the fore-aft direction. Observe
the fish school near the bow of the ship, or inspect the bot-
tom contour.
3 When approaching the fish school, change the beam direc-
tion to port-starboard by the TRAIN control and maneuver
the boat so that the fish are led into the trawl net.
4 To observe the hauling of the net, turn the sounding beam to
the fore-aft direction.
2 After detecting a fish school, steer the boat toward that
direction, turning off the "AUTO TRAIN" to observe that
direction.
Shoal
Fish
schools
Bow
Steered
angle
Net
Figure 3-16 Vertical fan mode usage in trawling