Our high accuracy, compact and affordable Motion Reference Units

MRU Compact

Usage area

IP 65

Heave accuracy

5 cm or 5.0%

Roll & Pitch accuracy

3000±0.05°
6000±0.02°
9000±0.01°

Connectors

RJ45 or RJ50

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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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MRU Ex

Usage area

Hazardous areas

Heave accuracy

5 cm or 5.0%

Roll & Pitch accuracy

3000±0.05°
6000±0.02°
9000±0.01°

Connectors

Pigtail cable

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Versatile Motion Reference Units for every budget and requirement

Find your perfect MRU solution designed to meet different budgets and requirements without compromising on quality, functionality, flexibility, performance, or cost-effectiveness.

Roll and pitch dynamic accuracy of 0.05° Heave accuracy: 5 cm / 5 %

The 6000 series provides high performance 0.02° roll and pitch accuracy

The 9000 series achieves exceptional precision with 0.01° roll and pitch accuracy

Which series should I choose?

This depends on your application, here are some general guidelines

The 3000 series, with 0.05° accuracy in Roll & Pitch, is ideal for most monitoring applications where the main purpose is to collect motion data for analysis or decision making. This model is also suitable for some control applications, such as AHC for smaller vessels with short lever arms to the remote monitoring points.

The 6000 series, with 0.02° accuracy in Roll & Pitch, is our most versatile MRU due to its high accuracy and is suitable for most applications. This is the recommended MRU for most control applications such as AHC and winch control.

The 9000 series, with 0.01° accuracy in Roll & Pitch is our most accurate MRU. We recommend this MRU for sensor compensation applications such as hydrography, and for advanced control applications such as 3D motion compensated gangways.

High accuracy motion measurements in any sea condition.

Market-leading performance in real sea conditions

Many suppliers tend to present test data solely for simple regular motions observed in laboratory conditions. Unfortunately, vessels experience irregular and coupled motions at sea. While most sensors perform well in sine wave motion, only a select few excel in irregular sea conditions.

Norwegian Subsea's unique sensor fusion algorithms get the most out of high-accuracy sensors, providing precision motion measurements in any sea conditions.

What makes our MRUs special?

Easy to use

All Norwegian Subsea Motion Reference Units (MRUs) can be easily configured using the MRU Configurator (free of charge).

Simply define the communication ports and protocols as well as the MRU mounting orientation and location, and you are ready to go.

The MRU Configurator is also a great tool to monitor the outputs in real-time, plot the variables, check the on-board diagnostics and update the MRU firmware.

Latest case studies

Light Structures

Making Structural Health Monitoring smarter with Motion Reference Units

As the maritime industry accelerates its journey towards smarter, more efficient digital operations, structural health monitoring systems are playing a central role in operational efficiency, safety and sustainability. These systems increasingly depend on real-time, high-fidelity data from Motion Reference Units (MRUs) to contextualise structural stresses with the vessel’s motion in a given sea state. This is especially important in meeting the evolving requirements of classification society SMART notations from bodies such as the American Bureau of Shipping (ABS) and DNV.

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ShoreConnection International

ShoreConnection ensures safe landing for thousands of helicopters with Norwegian Subsea Motion Reference Units

Helideck Motion Monitoring & Weather Data Systems (HMS) provide real-time motion and environmental data essential for flight planning and for pilots to remain in safe control during take off and landing from moving helidecks. The HMS depends on Motion Reference Units (MRU) installed directly on to the support structure that continuously measure the helideck’s movement. Leading HMS manufacturer ShoreConnection chooses MRUs built by Norwegian Subsea.

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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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Trusted by industry leaders

Over 1200 Norwegian Subsea Motion Reference Units are in operation world-wide on over 600 vessels, floating and subsea structures.

Some selected customer references.

Where our MRUs are used

What our customers say

"The motion compensation industry was overmature with too few players. Norwegian Subsea disrupted that business, bringing the sector several steps ahead."

Jonas Røstad, Chief Commercial Officer, Miros

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"Norwegian Subsea MRUs had the accuracy, the temperature range, and the enterprise-level quality we required"

Johnny Rabben, CEO, ShoreConnection

"Norwegian Subsea is lower cost than the high-end units while offering the level of data we need. It also comes with easy communication protocols and in an enclosure that is convenient to fit."

Karianne Pran, Director of Engineering, Light Structures

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"We specifically selected Norwegian Subsea MRUs due to their unmatched combination of accuracy, compact form factor, and ease of integration."

Gabriel Walton, Technical Director, Ultrabeam Hydrographic