3-22 3.0 SETUP AND ACTIVATION
4125 SIDE SCAN SONAR SYSTEM 0004823_REV_F
Figure 3-17: 4125 Towfish being Deployed
NOTE 1: For detailed towing characteristics for several tow cable lengths
and towfish speeds, refer to C.0 TOWING CHARACTERISTICS.
NOTE 2: For detailed information about the EdgeTech DISCOVER 4125
Side Scan Sonar software, including how to record data, refer to the
DISCOVER 4125 Side Scan Processor Software User’s Manual.
NOTE 3: This deployment instructions to follow assume that the system
pre-deployment test have been successfully completed and the tow fish
is on and transmitting.
To deploy the towfish:
1. With the survey vessel stopped or under way at up to two knots, slowly and carefully lower the
towfish into the water, well away from the propeller. Do not let the towfish strike the hull of the
survey vessel.
2. Lower the towfish to a depth of about three meters, or just below the propeller wash.