Does the MRU measure surge and sway?
Yes, our MRUs measure surge and sway.
Note, that as for heave, the measurements are around a zero-mean position. This means that for a ship that moved forward, it’s only the high frequency part of the surge motion that is measured by the MRU.
Accurate surge and sway measurements are dependant on accurate roll and pitch measurements, since small changes in roll and pitch influence the surge and sway measurements. That is why we recommend the 9000 series when surge and sway measurements are important. This can be for applications like 3D motion compensation.
Related products
Usage area
50 m depth, IP 68
Connectors
Lemo or SubConn 8 or SubConn 16
Roll & Pitch accuracy
- 3000±0.05°
- 6000±0.02°
- 9000±0.01°
Heave accuracy
5 cm or 5.0%
Usage area
IP 65
Connectors
RJ45 or RJ50
Roll & Pitch accuracy
- 3000±0.05°
- 6000±0.02°
- 9000±0.01°
Heave accuracy
5 cm or 5.0%
Further reading
MRUs for vessel performance optimisation in focus at Europort 2025
Research Project to Test Value of MRU Data for Vessel Performance and Carbon Reduction
Advanced motion compensation for sonars introduced at Ocean Business 2025
Related questions
- Read the full answer
Inclinometers offer basic static tilt readings, Roll & Pitch Sensors suit moderate motion, while VRUs provide precise roll and pitch in dynamic conditions. Choose based on motion complexity, accuracy needs, and budget.
- Read the full answer
Yes, the MRU supports heave output (position, velocity, acceleration) at two remote points, plus a third at the vessel's centre of gravity. This allows one MRU to serve multiple applications, like heave-compensated winches.
- Read the full answer
MRUs use advanced filtering algorithms like Kalman filters to remove noise and stabilise motion data. This ensures accurate 6DoF output for critical systems such as DP, AHC, sonar, and gangway control.
Related applications
Wind Turbines
Accurate and precise motion monitoring is crucial for wind turbine towers to ensure structural integrity and optimise performance.
Bridges
Accurate and high-resolution motion sensors are crucial for the structural monitoring of bridges.
Buildings
Accurate and high-resolution motion sensors are essential for the structural monitoring of tall buildings.
Motion Compensated Gangways
Accurate measurements of all 6 degrees of freedom are essential for the automatic motion control of gangways.
Riser Monitoring
The NORSUB Subsea MRU is specifically designed to provide highly accurate measurements of roll, pitch (inclination), and lateral motions in risers.
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