Edgetech 2000-DSS, User Hardware Manual

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3-16 3.0: SETUP AND ACTIVATION
2000-DSS Combined Sonar 0009335_REV_D
3.9 Tow Vehicle Deployment
Shown in F
IGURE
3-9 is a 670D Tow Vehicle being deployed.
CAUTION!
When lowering the tow vehicle in an area where the bottom
topography is not known, be careful not to strike the bottom or a
submerged object, otherwise damage to the tow vehicle may occur. In
addition, at all times during the survey, be sure to carefully monitor tow
vehicle altitude, as failure to do so may result in the tow vehicle hitting
the bottom or becoming snagged.
CAUTION! Do not tow the tow vehicle too close to the survey vessel.
Towing in this manner can cause the tow vehicle to be pulled in against
the hull of the ship due to the low pressure of the propeller wash and the
effect of the water flowing by the hull. In addition, sonar reflections from
the hull may be evident in the records.
CAUTION!
Do not tow the tow vehicle with the nose angled up or down.
Doing so can degrade the sonar imagery. Verify that the tow vehicle is as
level as possible when towing it.
NOTE: For detailed towing characteristics for the 2000-DSS Tow Vehicle
with several tow cable types and lengths and tow vehicle speeds, refer to
appendix
C.0 .
NOTE: For detailed information about the EdgeTech DISCOVER software,
including how to record data, refer to the “DISCOVER 2000-C Dual
Frequency Side Scan Software User’s Manual” or to the “DISCOVER Sub-
Bottom Software User’s Manual.”