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10. SET DETECTION THRESHOLD: this setting will vary depending on bottom types, but a good place
to start is about half of the peak signal displayed in the sonar signal amplitude display window.
11. SET TRACKING RANGE [M] [Display, Entry]: Adjust the width of the tracking window in meters.
(Typically, you want to track +- 2m either side of the first bottom return.
12. Increase the boat speed to the desired survey speed (normally between 3-5 knots) and re-adjust
the amount of cable out so that the altitude of the tow fish is correct. (Don't forget to reset the
cable out value in the layback settings).
13. Go to the DISK menu in the lower control tabs and choose a valid path for your files and give your
file a name
(F
3-6).
IGURE
14. Click the RED record button.
15. Verify the file size is getting larger.
NOTE:
After recovery, always wash your Towfish and cable with fresh
water. Coat connector terminals with silicon grease and install dummy
plugin wet end connectors.
Figure 4-4: Tracking Range
4-3
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