Edgetech 4205 - Acoustic Tracking System; Depressor Wing; Magnetometer Interface; Pressure Sensor

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1.3.1 SGB Compass
The 4205 Towfish comes with a standard compass that provides heading, pitch, and roll. The SGB Compass
option offers a light-weight sensor (45 grams) that includes: a MEMS-based Inertial Measurement Unit
(IMU) that integrates three gyroscopes, three magnetometers, and three accelerometers and an Ellipse-
AHRS running an extended Kalman filter (EKF) that provides accurate orientation data in both static and
dynamic conditions.
1.3.2 Depressor Wing
The EdgeTech Depressor Wing allows the towfish to be towed at greater depths and faster speeds without
increasing the length of tow cable in the water. The depressor wing attaches to the top of any 4205 towfish
and exerts a downward force on the towfish as it moves through the water, pushing it deeper. The angle
of the wing is adjustable to 0°, 5°, or 10°, depending on the desired dive angle. Optionally available trim
tabs on the back of the wing can be adjusted for fine-tuning its performance, and a safety cable is attached
to prevent loss of the wing should it become snagged.
1.3.3 Magnetometer Interface
Magnetometer’s from several manufacturers can be supplied and are compatible with EdgeTech's
optional magnetometer interface. See the 4205 Magnetometer Interface Option Documentation
(0021770) for more information. For Magnetometer Wiring Connections, see F
IGURE 2-6 AND FIGURE 2-7.
1.3.4 Acoustic Tracking System
A USBL acoustic tracking system, such as an EdgeTech BATS, can be used to provide the towfish position
continuously. A responder is installed on the towfish, and a ship-mounted hydrophone and deck unit are
used to receive and process position data.
1.3.5 Pressure Sensor
A stainless-steel pressure sensor can be installed in the towfish to provide towfish depth data. This type
of pressure sensor is designed for continuous use in a corrosive liquid environment and is available in a
3000-psi pressure range for the 4205-SP and 4205-MP towfish.
1.3.6 Responder
The tracking system deck unit provides a trigger that is input to the topside processor. The topside
processor outputs the trigger signal to the towfish by combining the signal with the downlink command
and uplink sonar data signals. The towfish will then output the TTL for a customer-supplied responder, as
well as trigger out the option connector.
There are many third-party responder beacons on the market, and properly interfacing them with the
4205 could be challenging. Please contact
CUSTOMER SERVICE for guidance in selecting and/or interfacing a
third-party beacon with the 4205.