Sonardyne Dynamic Positioning Transponder 6

DPT 6 is designed to be used as a seabed reference transponder by USBL acoustic positioning systems, installed on many Dynamically Positioned (DP) vessels. The DPT 6 supports Sonardyne’s latest Wideband®2 acoustic ranging and telemetry providing high accuracy positioning, robust performance in noisy and multipath conditions and easy set-up and use.


With hundreds of channels, less interference to and from other acoustic systems and multi-user capability, Wideband 2 enables easier SIMOPS vessel capability. These features of the DPT 6 help de-risk subsea operations and save vessel time and cost.

The DPT 6 is the standard length version and is based on the field proven mechanics of the previous version but with improvements to the end cap closure mechanisms. The design offers the perfect balance between size, acoustic output and battery life. Several depth ratings are available: 3,000 m, 5,000 m and 7,000 m, all hard anodised aluminium alloy with protective polyurethane sleeve. Midi (shorter) and Maxi (long endurance) options are also available. The DPT is fitted as standard with a highly reliable release mechanism to enable the unit to be deployed in a flotation collar and recovered to the surface without ROV intervention.

The DPT 6 is a midi-sized unit for deep water towfish tracking. Depth rated to 7,000 metres, the unit is fitted with a high power super directional transducer. The DPTi 6 is fitted with internal inclinometers to accurately monitor riser angles (see separate datasheet). The unit can also be used with an external inclinometer unit to monitor BOP and flex joint angles.


Technical information

Feature DPT 6 DPT 6 Midi DPTi 6
Depth Rating 3,000 metres 3,000 metres 5,000 metres
Operating Frequency MF (19–34 kHz) MF (19–34 kHz) MF (19–34 kHz)
Transducer Beam Shape Omni-directional Directional Directional
Transmit Source Level (dB re 1 µPa @ 1 m) 187–196 dB (4 Levels) 190–202 dB (4 Levels)  190–202 dB (4 Levels)
Tone Equivalent Energy (TEE)* 193–202 dB 196–208 dB 196–208 dB
Receive Sensitivity (dB re 1 µPa) 90–120 dB (7 Levels) 80–120 dB (7 Levels) 80–120 dB (7 Levels)
Ranging Precision Better than 15 mm Better than 15 mm Better than 15 mm
Number of Unique Addresses (Wideband 1 & 2) >500 >500 >500
Battery Life (Listening) 1390 Days (Lithium) 400 Days (Lithium) 1390 Days (Lithium)
Safe Working Load (4:1) (Release Mechanism) 250 kg 250 kg 250 kg
Dimensions; Length x Diameter 1035 x 134 mm 784 x 143 mm 925 x 143 mm
Weight In Air/Water** 23/12 kg 16/7.4 kg 25/12.5 kg
End Cap Sensors and Options
Temperature (±0.1°C) Standard Standard Standard
Tilt Switch (±30-45°) Standard Standard Standard
Strain Gauge Pressure Sensor (±0.1%) Standard Standard Standard
High Precision Strain Gauge (±0.01%)
Presens or Keller
Optional Optional Optional
Paroscientific DigiQuartz Pressure Sensor
1350 m, 2000 m, 3000 m, 6000 m (±0.01%)
Optional Optional Optional
Inclinometer (Tilt sensor)
Range ±90°, Accuracy: ±1°
Standard Standard N/A
High Accuracy Inclinometer
Range: ±90°, Accuracy: ±0.05° over 0 – ±15°;
±0.2° over 0 – ±45°
Optional Optional Standard
Sound Velocity Sensor
±0.02 m/s accuracy under calibration conditions
Optional Optional N/A
Release Mechanism Standard Standard Optional
Power for External Sensors Optional Optional Standard
Gyro Input Optional Optional Standard
Full Specification DPT 6 DPT 6 Midi DPTi 6





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