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Gyro iUSBL

Inverted USBL transceiver with gyro

Engineered for: AUV, Towfish

Gyro iUSBL turns a conventional USBL setup on its head. It combines a USBL transceiver and AHRS in a single subsea housing, and is designed to be mounted on a towed body so it can be tracked at laybacks in excess of 10,000 m.

At a glance

Designed to work with Ranger 2 USBL

Tracks your deep tow vehicle beyond 10,000 m

Integrated USBL transceiver and SPRINT INS

Depth rated to 7,000 m

Offers 10x improvement in positioning precision

Built for deep, long layback tracking

Want to know more?


Gyro iUSBL combines our generation high performance HPT Inverted USBL transceiver and a Lodestar Attitude and Heading Reference System (AHRS) / Inertial Navigation System (INS) in the same titanium pressure rated mechanical assembly capable of operating at depths of 7000 m.

With the AHRS / INS in fixed mechanical alignment to the iUSBL’s pressure balanced acoustic array, the Gyro iUSBL can be quickly deployed without need for a calibration to determine the alignment of the ship’s motion sensors to the acoustic transceiver. For many applications, this can enable significant time savings and operational costs.


Features Type 8084-000-7535
Operational Frequency MF (20–34 kHz)
Transceiver Performance Operating Range Up to 7,000 m
Pressure Rating Up to 7,000 m
Acoustic Coverage Up to ± 90°
Range Accuracy Positioning Repeatability Better than 15 mm All transceivers tested to Better Than 0.1% of Slant Range 1 drms
Transmit Source Level (dB re 1 µPa @ 1 m) 200 dB
Tone Equivalent Energy (TEE) 206 dB
Heading Range 0–360°
Accuracy 0.05 to 0.1° secant latitude
Settle Time <5 minutes
Follow Up Speed 500° / second
Resolution 0.01°
Pitch & Roll Range ±180º (No physical limit)
Accuracy 0.01°
Resolution 0.01°
Heave Range ±99 m
Accuracy (Real Time) 5 cm or 5% (whichever the greater)
Resolution 0.01 m
Electrical +48 V dc maximum 160 W
Communication RS485, baud rate switchable, ethernet 100 Mbps
Operating Temperature -5 to 40°C
Storage Temperature -20 to 55°C
Dimensions (Length x Diameter) 640 mm x 240 mm (without end connector)
Weight in Air/Water 56.4/32 kg

Manuals and quick start guides

Software and firmware

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Built for deep, long layback tracking