Simrad SD570, Operator'S Manual

Page: 42 / 128

Simrad SD570
12 850--160138 / A
2.10 Omni/Echo sounder
This mode is also specially made for trawling, but in this mode
the trawl--locked vertical slice is replaced by an echo sounder
recording. This to ensure a more correct depth indication in
case the sonar beam is bent because of temperature layers.
Figure 9 - Omni/Echo sounder
In order to get the school presented in the echo sounder
recording, the vessel must here pass over the target.
Figure 9 also shows a typical pelagic trawling situation where
automatic tilting is selected. The dot in front of the school
shows the position of the school after 8 minutes, selected in the
MOVEMENT submenu.
The falling line in the echo sounder recording shows the sinking
of the trawl.