Simrad ES70
3
Increase the
Bottom Backstep
level (make it more positive).
A typical setting would be approximately -30 dB, but you will need to experiment
to find the best value for the operational frequency and the current bottom and
sea conditions.
The ES70 will now provide increased penetration, and show you a detected bottom
that is slightly deeper than the actual value. This will cause the flatfish to be shown
as if they were located “above” the bottom.
4
Click
OK
to save the current settings and close the dialog.
How to adjust the bottom detection to find seagrass
The ES70 provides the
Bottom Backstep
parameter in the
Bottom Detector
dialog. If you
have an Olex system, you can use this parameter to enhance the detection of seagrass.
→
on page 115
1
Click the
Active
icon under the
Main
menu to open the
Active
menu.
→
on page 107
2
On the
Active
menu, click
Bottom Detector
to open the
Bottom Detector
dialog.
This dialog is used to define various parameters associated with the bottom
detection. These include the depth range, where the ES70 searches for the bottom.
3
Decrease the
Bottom Backstep
level to a lower value (make it more negative).
A typical setting would be approximately -60 dB, but you will need to experiment
to find the best value for the operational frequency and the current bottom and
sea conditions.
The ES70 will now show you a depth value that is shallower than the actual depth.
4
Observe the true depth on the Olex system.
The difference between the two depths indicate the height of the seagrass.
5
Click
OK
to save the current settings and close the dialog.
Size distribution, biomass and fish density
If you use a “split beam” transducer on your ES70, it will you provide you with
information about the size distribution and density of the fish beneath the hull.
Topics
•
How to monitor the fish size distribution
on page 93
•
How to adjust the fish length for correct calculations
on page 94
92
343539/B
Содержание ES70 - DOWNLOAD AND INSTALLATION REV B
Страница 2: ......
Страница 128: ...ISBN 13 978 82 8066 118 0 2010 Kongsberg Maritime AS ...
