Gyro USBL – Precalibrated Acoustic Transceiver

All-in-one instrument; combined 6G acoustic transceiver and AHRS
Choose between standard or ‘plus’ variants to suit your project’s specifications
Optimises the performance of Ranger 2; eliminates lever arm offsets, pole bending and ship flexing errors
Up to 20% shorter and 19 kg lighter than previous version; perfect for over-the-side poles, stingers and confined spaces
Calibrated in-water before delivery; install it and go to work

Lighter, smaller, just as capable. Meet our second generation Gyro USBL transceiver

If you’re using a Ranger 2 system to track the position of a subsea target from a vessel of opportunity, over an extreme range, or from a pipelay vessel’s stinger, Gyro USBL delivers the highest precision available – now pre-calibrated direct from us.

Designed for Ranger 2, Gyro USBL is an all-in-one instrument that combines our 6th generation (6G) High Precision Acoustic Positioning (HPT) acoustic transceiver and Lodestar Attitude and Heading Reference System (AHRS) in the same unit. This combination eliminates alignment errors seen in conventional USBL systems that are dependent upon a vessel’s own attitude and heading sensors.

Our latest generation design is supplied in-water pre-calibrated meaning that you can get to work as soon as it’s fitted, saving you valuable vessel time. Gyro USBL has always been available in two different array designs, optimised for deep water and long layback operations. Now additionally, you can choose between standard and ‘plus’ AHRS performance grades. Depending on the array type and AHRS grade, Gyro USBL can offer precision of better than 0.1% of slant range out of the box.

Gyro USBL has always been a popular choice for installations on vessels-of-opportunity using through-hull or over-the-side deployment arrangements, or even the tip of pipelay vessel stingers, where Ranger 2 is being used to track the vessel’s own ROV as it conducts touchdown monitoring – often at extreme lay backs.
But now Gyro USBL is significantly smaller and lighter than its predecessor, smaller vessels, including unmanned surface vessel (USVs), can now gain the best performance possible from their Ranger 2 system. The new design is also still be manufactured in corrosion-resistance aluminium-bronze, so ideally suited to use in any waters.

Why Gyro USBL?

Acoustics & AHRS

  • Heading accuracy 0.1° for ‘plus’ variant
  • 7000 expected system slant range accuracy 1 DRMS (20 dB) 0.04°
  • Pitch and roll accuracy 0.01°
  • Heave accuracy (real time) 5 cm or 5% (whichever the greater)


  • Works with Ranger 2 USBL and Marksman LUSBL systems
  • 439 x 225 mm (5000 variant); 508 x 310 mm (7000 variant)
  • 9 to 19 kg weight saving in air; 15 to 40% lighter than previous models
  • Aluminium-bronze and plastic construction. ROHS compliant
  • Calibration free offering rapid mobilisation


  • Calibration free offering rapid mobilisation
  • 7000 tested to better than 0.07% of slant range 1 Drms
  • Pitch and roll accuracy 0.01°
  • Heave accuracy (real time) 5 cm or 5% (whichever the greater)


  • What’s in the box: Gyro USBL and manual
  • Warranty: 1 year return to Sonardyne service centre
  • ITAR Controlled: No
  • UK Export License: required; US Export License: covered under de minimis

More about this product

Gyro USBL Specifications & DataSheet

Feature   Gyro USBL 5000    Type 8084-0425
Gyro USBL 5000+  Type  8084-0455
Gyro USBL 7000    Type 8084-0427
Gyro USBL 7000+  Type  8084-0457
Operating Frequency   MF (19–34 kHz) MF (19–34 kHz)
Operating Range
Acoustic Coverage

Range Precision
Positioning Repeatability*

Up to 7,000 m
Up to ±90º

Better than 15 mm
All transceivers tested to better than 0.1% of slant range 1 Drms

Up to 7,000 m
Up to ±90º optimised for deep water (depending on frequency of operation)

Better than 15 mm
All transceivers tested to better than 0.07% of slant range 1 Drms

Transmit Source Level SL = dB 1 µPa @ 1 m
Tone Energy Equivalent (TEE)**
200 dB
206 dB
Heading Accuracy
(Secant Latitude)
Plus variant  0.1°
Standard variant 0.2°
  Settle Time <5 minutes in dynamic conditions  
  Follow-up Speed 500°/second  
Pitch & Roll Accuracy 0.01°  
Heave Range ±99 m  
  Accuracy (Real Time) 5 cm or 5% (whichever the greater)  
Electrical   +48 V dc Max 160 W  
Connector   AGP-2716  
Communication   RS485, Baud Rate Switchable
Ethernet 100 Mbps
Environmental Operating Temperature -5 to 40°C  
  Storage Temperature -20 to 45°C  
Dimensions; Length x Diameter   439 x 225 mm 508 x 310 mm
Weight in Air/Water***   32/18 kg 55/35 kg

Note 1. The The absolute accuracy of the system is dependent upon the quality of attitude and heading sensors, beacon source level, vessel noise, water depth, mechanical rigidity of the transceiver deployment machine and proper calibration of the total system using CASIUS.

*Dependent on frequency; typical figure shown for frequency band of instrument
**TEE – WBv2+ signals are 4x the duration of Sonardyne tone signals (WBv1 & WBv2 are 2x). The TEE figure shows the operational performance when comparing wideband and tone systems.
***Estimated Weights



Instrument Firmware
Lodestar Firmware
HPT Firmware


Technical Bulletins

Title Description

Storage and operation temperatures

This technical bulletin has been issued to draw customers’ attention to a potential issue with all variants of HPT or GyroUSBL caused by either inadvertent storage or operation at temperatures exceeding the stated specifications.
Lodestar based product export licensing – No: TB13-007 Sonardyne has received several enquiries from Customers who have purchased Sonardyne Lodestar based products (currently Lodestar, SPRINT, Lodestar GyroCompatt and Lodestar GyroUSBL) about the requirement to have the product licensed by the US Department of Commerce. This document describes the US Department of Commerce licensing requirements for Lodestar based products.
Lodestar based product export licensing – No: TB13-003 Sonardyne is pleased to issue new guidelines on the re-export licences for our Lodestar GyroUSBL and Lodestar GyroCompatt products. These products contain components which are licensed under the EAR by the US Department of Commerce.



To request a manual simply tick the box next to the manual you require and then press the Request Form button. You will then be able to request addition manuals for other products and your request will be emailed to our Customer Support Team who will reply to your enquiry. Alternatively please contact your local office who will be more than happy to help.

User Manual - Gyro USBL

  • Manuals Request

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