Hydrography
Accurate measurements of roll, pitch, and heave are crucial for achieving optimal results when compensating multibeam echosounders for vessel motion.
Hydrography
The future of sonar motion compensation - High-Precision - Always reliable - Low cost
The Game-Changer for Sonar Accuracy in Challenging Environments
Motion Reference Units (MRUs) are crucial in bathymetric survey technology, providing precise motion compensation data to ensure reliable and accurate seafloor mapping. The Norwegian Subsea MRU has redefined what is possible, delivering exceptional performance even in incredibly challenging conditions. Our technology provides high-accuracy roll, pitch, and heave compensation without dependency on RTK or GNSS signals, eliminating common vulnerabilities in sonar mapping.
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Designed specifically for marine applications
The NORSUB MRU Marine is a robust and waterproof motion reference unit designed specifically for marine applications, with flexible communication options and the option to include a magnetometer.
Read more about the MRU MarineSonar systems that use our MRUs
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Related questions
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What is the difference between the MRU Marine and MRU Marine SW?
- The MRU Marine has an IP-68 rating, uses a Lemo 16-pin connector and has indicator lights.
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When navigating the complexities of motion sensing and navigation systems, it is essential to understand the distinctions between devices and systems like Inertial Measurement Units (IMUs), Inclinometers, Roll & Pitch sensors, Vertical Reference Units (VRU), Attitude and Heading Reference Systems (AHRS), Motion Reference Units (MRUs), Gyrocompasses, and GNSS-Aided Inertial Navigation Systems (GNSS/INS). Each serves specific purposes and offers different levels of functionality, accuracy, and application scope.
Gyrocompass
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The MRU Compact uses a standard RJ45 ethernet cable where power is supplied through Passive PoE (Power over Ethernet). In most cases you cannot connect the MRU directly to a an ethernet switch with PoE, since most of these are Active PoE.
We normally supply your first MRU Compact with a start kit containing a POE RJ45 spliter socket. You will only need standard RJ45 cat5 ethernet cables to connect the MRU to the spliter socket and the spliter socket to your PC or ethernet switch.
Further reading
Advanced motion compensation for sonars introduced at Ocean Business 2025
MRUs for vessel performance optimisation in focus at Europort 2025
