Motion Reference Units for Commercial Fisheries

picture of Fishing boat trawler sailing out at rough sea

Motion Reference Units for Commercial Fisheries

Commercial fishing vessels, trawlers, purse seiners, and longliners, operate in some of the most demanding sea conditions encountered by any working vessel. They depend on accurate sonar data to locate fish and read the seabed, yet the motion sensor feeding that sonar is often the weakest link in an otherwise high-end system, limiting performance in exactly the conditions where it matters most.

Market-leading Motion Reference Unit for Omni-Directional Fish-Finding Sonars

Norwegian Subsea MRUs deliver accurate, real-time motion data independently of RTK or GNSS correction, making them effective in the most exposed offshore fishing grounds. Compact, ready-calibrated, and maintenance-free, they are a cost-effective upgrade that unlocks the full potential of any omni-directional sonar system.

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Our high accuracy, compact and affordable MRUs

MRU Marine

Usage area

50 m depth, IP 68

Heave accuracy

5 cm or 5.0%

Roll & Pitch accuracy

3000±0.05°
6000±0.02°
9000±0.01°

Connectors

Lemo or SubConn 8 or SubConn 16

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MRU Subsea

Usage area

6000 m depth

Heave accuracy

5 cm or 5.0%

Roll & Pitch accuracy

3000±0.05°
6000±0.02°
9000±0.01°

Connectors

SubConn 8

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What our customers say

"The Norwegian Subsea MRU was like a needle – smooth and precise."

Sid Hynes, Master Mariner, Owner and Skipper of 'Best Kind'

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"The accuracy, weight, and form factor of Norwegian Subsea MRUs are unmatched."

Gabriel Walton, Technical Director, Ultrabeam Hydrographic

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Latest case studies

Ultrabeam Hydrographic

Ultrabeam Hydrographic enhances high-resolution 3D surveys with Norwegian Subsea Motion Reference Units

Ultrabeam, a specialist in hydrographic survey and underwater inspection, relies heavily on precise motion compensation to ensure accuracy in their 3D mapping projects. By integrating Norwegian Subsea’s compact, calibration-free Motion Reference Units (MRUs), Ultrabeam has significantly improved its survey data accuracy, while enjoying simplified integration, and enhanced operational efficiency in diverse surveying environments, from bridges, to offshore installations.

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Sid Hynes, Master Mariner

Canadian shipwreck hunters unlock new levels of multibeam performance with Norwegian Subsea Motion Reference Unit

Motion Reference Units (MRUs) are crucial in bathymetric survey technology, providing precise motion compensation data to ensure reliable and accurate seafloor mapping. For users like Captain Sid Hynes, a seasoned mariner exploring Newfoundland’s shipwreck-rich waters, the Norwegian Subsea MRU has redefined what is possible, delivering exceptional performance even in incredibly challenging conditions.

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WASSP Boosts Multibeam Accuracy for Marine Survey and Fish Finding with Norwegian Subsea Motion Reference Units

Norwegian Subsea’s Motion Reference Units (MRUs) are now available integrated with WASSP’s multibeam sonar systems, offering enhanced motion data accuracy and performance for offshore applications.

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