Precise motion measurements are essential for Crew Transfer Vessel operations, supporting crew safety, passenger comfort, operational window assessment, and safe vessel-to-turbine transfer.
With accurate real-time data on roll, pitch, heave, and all six degrees of freedom, Norwegian Subsea MRUs help CTV operators monitor vessel behaviour in demanding sea conditions, assess safe operational limits at speed, and critically — measure heave motion at the point of contact when pushing onto a fixed offshore wind turbine foundation. Knowing the exact heave behaviour at the bow is essential for safe crew transfer and protecting both personnel and the vessel.
Beyond transfer safety, MRU data establishes the correlation between sea conditions, vessel response, and main engine consumption, giving operators the insight needed to optimise propulsion and reduce fuel consumption on every run. With growing IMO reporting requirements, most operators already have flowmeters in place, but motion data remains a missing piece. Adding an MRU closes that gap, enabling more accurate performance benchmarking and emissions reporting.
Motion Reference Units (MRUs) enhance both regulatory compliance and insurance relations for CTV operators by providing verified motion data that documents safe operations, supports transparent reporting, and protects against liability — particularly in the high-frequency, high-exposure environment of offshore wind crew transfer.
Accurate motion data helps CTV operators demonstrate compliance with regulations governing passenger vessel safety and crew transfer operations, including IMO SOLAS requirements and offshore wind-specific standards set by national maritime authorities and wind farm operators.
In the event of an incident, whether during transit or at the point of turbine contact — MRU data provides a precise log of vessel motion, heave behaviour, and sea conditions at the time. This factual record is critical for investigations by maritime authorities or wind farm owners, and helps operators demonstrate that the transfer was conducted within approved operational limits.
CTV insurance policies typically require vessels to operate within defined sea state and motion limits. MRU data allows operators to document continuous compliance with these conditions across every run, supporting smoother claims processing and reducing the risk of denied or disputed coverage.
In cases of personnel injury, vessel damage, or turbine contact incidents, MRU data provides a factual account of vessel motion and heave at the moment of the incident. This protects operators against unfounded liability claims and provides the transparency required by both insurers and wind farm operators when assessing responsibility.
50 m depth, IP 68
5 cm or 5.0%
Lemo or SubConn 8 or SubConn 16
IP 65
5 cm or 5.0%
RJ45 or RJ50
"We have tried similar MRUs and Norwegian Subsea was the clear choice, not only for the quality of data, but also the ease of integration"
"The whole industry is welcoming these MRUs."
"They are rock solid. Many Norwegian Subsea MRUs have been running 24/7 inside Miros products for up to eight years without issue, producing real-time data every second."
"The Norwegian Subsea MRU was like a needle – smooth and precise."
