HEADINGAND ATTITUDE, ACOUSTICALLY AIDED INERTIAL NAVIGATION AND DOPPLER VELOCITY SENSORS
Flexible,cost-effective and easy to use subsea navigation

With a track record spanning 10 years in survey, dynamic positioning and vessel applications, our Lodestar Attitude and Heading Reference Sensor (AHRS) and SPRINT Inertial Navigation System (Subsea INS) range has now evolved into its 3rd generation to meet the needs of any subsea application with a smaller housing, and a new range of performance levels. When combined with our Syrinx Doppler Velocity Log, Lodestar and SPRINT provide unprecedented levels of performance and a single offering for ROV guidance and survey.

WE RECOMMEND THESE FOR ROV GUIDANCE AND BASIC SURVEY TASKS
Lodestar 200 AHRS Lodestar 300 SPRINT 300
Lodestar 200 AHRS A cost-effective north-seeking gyrocompass with class-leading performance (0.4° Sec Lat Heading) and settling time. Provides extended outputs (acceleration and rotation rates) for ROV DP. Upgradeable to Lodestar 300 or SPRINT 300. Lodestar 300 AHRS Lodestar 300 is a robust and reliable subsea AHRS that provides 0.2° Sec Lat Heading within 15 minutes of starting and can settle in dynamic conditions. Available with many connector and endcaps options to suit most ROV integration requirements. SPRINT 300 INS The lowest cost subsea INS available with less than 0.1° Sec Lat Heading. Supports dual ROV and Survey use and standalone ROV guidance. Also provides mid-water station keeping with vendor independent USBL aiding.
WE RECOMMEND THESE FOR DEMANDING SURVEY TASKS AND ROV GUIDANCE
Lodestar 500 SPRINT 500 SPRINT 700
Lodestar 500 AHRS A survey grade, proven AHRS with 0.1° Sec Lat Heading available after 5 minutes of settling time. Common with all Lodestar/ SPRINT units, Lodestar 500 is re-calibration free and has an internal battery allowing continuous operation during loss of power for short periods SPRINT 500 INS Supports tightly integrated sparse LBL range aiding from Sonardyne 6G beacons, which have demonstrated cost savings in field operations since 2012. Perfectly suited to demanding multibeam survey operations with automatic, proven pressure and swell compensation.  SPRINT 700 is one of the highest performance INS systems available under dual use export control. With tight integration to Sonardyne acoustics, it supports the most demanding subsea survey tasks such as mobile laser mapping and acoustic inertial metrology.

SPRINT SYRINX – Combined Subsea INS and DVL

INS/DVL Combined Unit

Combined INS and DVL Syrinx provides tight beam-level aiding to SPRINT INS that allows for unprecedented DVL positioning performance and can continue to operate even if one or two DVL beams are unavailable. Standalone 3rd generation Lodestar and SPRINT units are engineered to mechanically ‘mate’ with Syrinx DVL using matching endcap alignment dowels. This provides the performance and space benefits of pre-calibrated and repeatable inertial and DVL but either unit can be swapped out.

For the ultimate integration, Lodestar/SPRINT and Syrinx are also now available as a single combined unit. The result is one of the smallest inertial DVL instruments available on the market. Available with an optional internal intelligent pressure sensor it provides a single unit for almost any ROV and survey task. In the combined unit, each Syrinx transducer has a full depth rated water block to ensure protection of the internal components. When supplied together, most combinations of Lodestar/SPRINT and Syrinx are unlikely to require a re-export licence, making shipping easier.