1-5
Figure 1-3: 4125 Tow Cable
1.7 Optional Equipment
Optional equipment that can be installed and used with a 4125 Series Dual-frequency Side Scan Sonar
System includes:
Keel Weight Kit (Part Number 0008464)
Depressor Wing Kit (Part Number 0007860)
HullScan Kit (Part Number 0008477)
Marine Magnetics Sea Spy II and Explorer Magnetometer Interface (Part Number 0016344)
1.7.1 Depressor Wing
The Depressor Wing Kit provides a depressor wing (shown in FIGURE 1-4) that can be attached to the
towfish, allowing it to be towed deeper and faster without increasing the length of tow cable in the water.
The depressor wing attaches to the top of the towfish and pushes it deeper by exerting a downward force
on the towfish as it moves through the water. A safety cable with a shear pin mechanism is attached to
prevent loss of the towfish and wing should it become snagged.
Installation of the optional Depressor Wing is described in sub-section 3.9.2: INSTALLING THE DEPRESSOR
WING, and an ICD drawing is provided in (refer to FIGURE 2-8).