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7. Test that the vehicle's compass is working correctly by moving the towfish and checking that the
pitch and roll are reported correctly in the Main Status Line Display in Discover.
Verify that the starboard roll is correct by rotating the fish's tow arm towards its starboard
•
direction around 20 degrees. The Roll value should be positive in this direction. (max is +180
degrees).
•
Verify that the port roll is correct by rotating the fish's tow arm towards its port direction
around 20 degrees. The Roll value should be negative in this direction. (max is -180 degrees).
•
Verify that the pitch is working correctly by lifting the nose of the fish. The pitch value should
read positive and reach a max of +90 degrees.
•
Verify that the pitch is working correctly by lifting the tail of the fish. The pitch value should
read negative and reach a max of -90 degrees.
4.1.9 3400 Tow Vehicle Deployment
The 3400 Tow Vehicle can be towed using the tow cable purchased with the vehicle. The towfish end of
the cable should be secured to the bridle shackle with the cable grip, and the tow cable is then run down
along a towfish bridle arm to the connector where both ends are mated. Cable ties should be used to
secure the cable to the bridle arm giving the tow cable enough slack between the shackle and connector
to prevent the endpoints from being pulled loose. Load bearing cables can be used by attaching them to
the bridle shackle.
Figure 4-10: 3400 Tow Cable Grip Bridle Shackle Attachment
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