4-50
2050-DSS SIDE SCAN AND SUB-BOTTOM SYSTEM 0024048_REV_A
selection. Refer to the D
ISCOVER 2050-DSS SOFTWARE MANUAL for details on the bottom tracking
setup.
7. Increase the survey vessel speed to the desired survey speed and adjust the amount of cable out
such that the altitude of the Towfish remains at 10–15% of the range selection.
8. If a pressure sensor is installed, verify that the Pressure display indication is working.
9. Secure the tow cable to the survey vessel.
10. Begin recording data.
4.9 Towfish Layback Charts
The following towfish layback charts are provided to assist in towing. Please consider the following points
if they are used:
• The standard 2050 towfish currently supports depths no greater than 2000 meters.
• The results listed in these tables are calculated using the Woods Hole WHOI cable program with
best-estimated parameters for vehicle weight and buoyancy and cable weight and stiffness.
EdgeTech disclaims any liability for consequential damage resulting from using the data in the
tables.
• An error of +/-5% applies to all predicted depth and tension values. In some but not all cases,
there is a local minimum in max cable tension as a function of speed occurring at roughly 4 kts,
and is not an error. As a result of the lift and drag summed over the entire catenary curve, some
tension is relieved for slow speed cases relative to the at-rest case or higher speed cases
• A combination of too much cable paid out and too slow a tow speed will exceed the maximum
vehicle depth. Conversely, too much cable paid out and too fast a tow speed will result in
exceeding the tow cable’s max working load. Consult the charts for specific examples.
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