Edgetech 2000-CSS, User Manual

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3-16 3.0: SETUP AND ACTIVATION
2000-CSS COMBINED SONAR 0017423_REV_C
3.9 Towfish Deployment
Consider the following Cautions and Notes before deploying the Towfish:
CAUTION!
When lowering the towfish 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 towfish may occur. In
addition, at all times during the survey, be sure to carefully monitor
towfish altitude, as failure to do so may result in the towfish hitting the
bottom or becoming snagged.
CAUTION! Do not tow the towfish too close to the survey vessel. Towing
in this manner can cause the towfish 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 towfish with the nose angled up or down.
Doing so can degrade the sonar imagery. Verify that the towfish is as level
as possible when towing it.
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.”