Sonardyne Lodestar GyroCompatt

The Lodestar GyroCompatt (LGC) integrates Sonardyne’s Wideband® acoustic positioning and Lodestar Attitude and Hearing Reference Technology (in one small, highly versatile and robust instrument). This provides high update rate wireless attitude, heading, heave, surge, sway, pressure, SV and acoustic positioning of any subsea object



Compatible with USBL and LBL positioning systems, the Gyro Compatt 6 product family provides real time motion data for structure deployment via the integrated high speed acoustic modem.

The internal high capacity rechargeable battery pack enables quick charge times and up to 20 hours of continuous operation with the ability to turn the gyro on and off to save battery life giving over two months of transponder life. The instrument is small and light enough to be ROV installed and a mechanical stab enables precision alignment to any structure.


Structure position and orientation can be accurately determined during lowering, set-down and as-built surveys. Using the Gyro Compatt 6 for metrology delivers the measurements required for pipe-end coupling.
The stab, gyro and transducer are pre-aligned and this speeds up spot measurements as only single observations are required.
Autonomous logging negates the need for a vessel and ROV to be on standby taking measurement during long term settlement observations.
Modular construction allows for upgrade and service access to the transponder module.

Technical information

Feature Type 8084-3164 – Lodestar Gyro Compatt 6
Opertaing Temperature -10ºC to +50ºC
Operating Shock Rating 22 g, 11 ms Half Sine
External Battery Pack / ROV Supply 24 V (20–50 V)
Battery Life Acoustic Navigation Standby 3 Months
Lodestar Permanently Powered On 28 Hours
Acoustic Compatt Operating Frequency MF (19–34 kHz)
Transmit Source Level 185–192 db re 1 uPa @ 1 m (5 levels)
Positioning Accuracy Better than 15 mm
Telemetry Protocol Sonarydne SMS and Modem
Ranges Tracked 14 simultaneous replies
Lodestar AHRS Heading Range 0–360°
Accuracy 0.04 to 0.1° secant latitude
Settle Time Less than 5 minutes
Follow Up Speed 500º / second
Resolution 0.01º
Roll & Pitch Range ±180º (No physical limit)
Accuracy 0.01º
Resolution 0.01º
Heave Range ±99 m
Accuracy (Real Time) 5 cm or 5% (Whichever the greater)
Bandwidth User Selectable
Resolution 0.01 m
Digital Output Output Telegram (e.g. For ROV LED display Yes
ROV Switch Contact Closure Yes
Data Back-up Data Logger 8 GB internal memory (expandable to 32 GB) to allow
post processing of mission data
Options Remote Transducer for ROV applications Available
Sensors Sound Speed Sensor +/- 0.03 m/s
Pressure (Strain Gauge or Paroscientific DigiQuartz) 0.01% FS
Physical Size (Diameter x Length) 247.8 x 917.2 mm
Weight in Air/Water 45/17 kg



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