Fit our combined gyrocompass and attitude heading reference system (AHRS) or inertial navigation system (DP-INS) or doppler velocity log (DVL) technologies to your vessel to benefit from continuously available, survey grade data to aid navigation. These systems have been designed to support a wide variety of vessel operations from deep water DP reference to shallow water manoeuvring. All offer low maintenance, high mean time between failure and simple ownership logistics thanks to their calibration-free design and UK manufacture.


Lodestar is a high performance, north-seeking gyrocompass and AHRS that replaces the need for a separate Motion Reference Unit (MRU) and gyro. It uses the same Ring Laser Gyros (RLG) and accelerometers fitted to most commercial airliners and space exploration platforms so you can be assured of class-leading levels of performance and reliability with low service intervals.

When used with a Sonardyne Ranger 2 system, Lodestar will improve overall system performance by optimising motion compensation – a configuration known as Optimised USBL.


If your vessel needs to combine efficiency with ultimate positon reference reliability to support DP operations, DP-INS provides the answer. It exploits the complementary characteristics of our Wideband® 2 acoustic signal technology found in Ranger 2 and Marksman with high integrity inertial measurements. The resulting, tightly-coupled navigation output is resilient to acoustic disruptions and Global Navigation Satellite System (GNSS) instability, for example due to

DP-INS is built around the same hardware platform as Lodestar and can support dual operating modes; AHRS and acoustically-aided INS.


Our hull-mounted Syrinx DVL accurately calculates seabed-referenced velocity and is suitable for use on vessels operating in continental shelf waters. Combined with DP-INS, it provides reliable vessel positioning, even when GNSS is denied. DVL and INS combined are extremely precise making them ideal for manoeuvring at slow speed (e.g. docking) when other navigation sensors become less effective. In addition to measuring speed over ground, Syrinx also measures current speed and direction through the water column to help optimise fuel efficiency.

Syrinx is easy to install and interface with existing bridge navigation systems thanks to its use of industry standard survey telegrams. Unlike many DVLs, Syrinx’s signal processing technique can continue to output high precision speed over ground in water depths ranging from less than one metre to 175 metres. Speed through the water can be measured in any water depth.