How do I choose the right MRU for subsea applications?
When selecting a motion sensor for subsea applications, the right choice combines robust design, deep‑water capability, high accuracy, and ease of integration. At Norwegian Subsea we recommend our MRU Subsea model for these demanding conditions.
Why choose the MRU Subsea?
The MRU Subsea is engineered specifically for underwater operations. It features a compact titanium housing rated to 6000 metres depth, making it ideal for use on ROVs, AUVs, riser monitoring systems, BOP monitoring, subsea surveys and inspection platforms. Its small footprint and ability to be mounted in any orientation allow for flexible installation in space‑constrained subsea environments.
It offers high‑accuracy 6 Degrees of Freedom (6DoF) motion data including Roll, Pitch, Yaw, Heave, Surge and Sway. Roll & Pitch accuracies are available in ±0.05°, ±0.02° and ±0.01° options depending on the series. The unit integrates seamlessly via a Subconn wet‑mateable connector and supports both Ethernet (UDP, Modbus TCP, Ethernet/IP) and serial (RS‑232 or RS‑485) communication. It is built with advanced MEMS sensors and proprietary fusion algorithms, delivering validated real‑sea performance often without the need for recalibration.
For projects that only require Roll and Pitch measurements, Norwegian Subsea also offers VRU/Inclinometer versions of the MRU model, offering the same high angular accuracy at lower cost.
How to buy the MRU Subsea
To purchase a motion sensor for subsea use, please contact Norwegian Subsea directly. Our team will guide you through selecting the appropriate model based on your environmental conditions, accuracy requirements, data protocol needs and connector options. Provide us with your application details and we will support you with a tailored solution.
Related products
Usage area
6000 m depth
Connectors
SubConn 8
Roll & Pitch accuracy
- 3000±0.05°
- 6000±0.02°
- 9000±0.01°
Heave accuracy
5 cm or 5.0%
Further reading
Advanced motion compensation for sonars introduced at Ocean Business 2025
MRUs for vessel performance optimisation in focus at Europort 2025
Research Project to Test Value of MRU Data for Vessel Performance and Carbon Reduction
Related questions
- Read the full answer
Motion monitoring is a cornerstone of safety, operational efficiency, and asset protection in the offshore industry: whether on vessels, platforms, or subsea equipment.
- Read the full answer
Norwegian Subsea’s Motion Reference Units (MRUs) are designed to deliver real-time data through a combination of high-end MEMS sensors, advanced sensor fusion algorithms, and onboard data processing systems.
- Read the full answer
Selecting the right motion sensor for use on Remote Operated Vehicles (ROV) is essential, and Norwegian Subsea provides specialised solutions tailored for these needs.
Related applications
Subsea Surveys
Subsea surveys often demand precise tilt measurements (roll and pitch) for various purposes, such as installation tasks or continuous monitoring of tilt changes and deflections in subsea structures.
Riser Monitoring
The NORSUB Subsea MRU is specifically designed to provide highly accurate measurements of roll, pitch (inclination), and lateral motions in risers.
BOP Monitoring
Accurate motion sensors play a crucial role in the structural monitoring of Blowout Preventers (BOPs), enabling the measurement of inclination and lateral displacements.
Hydrography New
Accurate measurements of roll, pitch, and heave are crucial for achieving optimal results when compensating multibeam echosounders for vessel motion.
Hydrography
Accurate measurements of roll, pitch, and heave are crucial for achieving optimal results when compensating multibeam echosounders for vessel motion.
ROV/AUV
Reliable motion sensors are vital components in the navigation system and motion compensation of payload sensors for ROVs and AUVs.
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