Latest Faq

Yes. An MRU provides high-resolution measurements of roll angles, which makes it an effective tool for inclining tests (stability verification / "krengeprøve"). Unlike traditional pendulums, an MRU can deliver accurate data even when the test is carried out at sea under less-than-ideal conditions. By filtering out wave-induced motions and recording precise responses to applied test weights, the MRU improves both accuracy and efficiency of the inclining test.

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The HS/commodity code for Norwegian Subsea MRUs is 9015.80.0000

A commodity code, also known as a Harmonized System (HS) code or tariff code, is a standardized numerical method used to classify traded products for customs purposes. It's crucial for calculating import duties, taxes, and identifying potential trade restrictions. These codes are globally recognized and consist of a specific number of digits, typically eight for exports and ten for imports.

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Related Faq (MRU marine)

The HS/commodity code for Norwegian Subsea MRUs is 9015.80.0000

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The MRU dimensions depend on the selected casing.

MRU Compact

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What is the difference between the MRU Marine and MRU Marine SW?

The MRU Marine has an IP-68 rating, uses a Lemo 16-pin connector and has indicator lights.

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When navigating the complexities of motion sensing and navigation systems, it is essential to understand the distinctions between devices and systems like Inertial Measurement Units (IMUs), Inclinometers, Roll & Pitch sensors, Vertical Reference Units (VRU), Attitude and Heading Reference Systems (AHRS), Motion Reference Units (MRUs), Gyrocompasses, and GNSS-Aided Inertial Navigation Systems (GNSS/INS). Each serves specific purposes and offers different levels of functionality, accuracy, and application scope.

Attitude and Heading Reference System (AHRS)

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Understanding the Differences Between IMU, Inclinometer, Roll & Pitch sensor, VRU, AHRS, MRU, Gyrocompass, GNSS/INS

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Manual FAQ

Gyrocompass

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Product Card Section

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

Learn more

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

Learn more

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

Learn more

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Product Variant Section

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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

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Navn Navnesen
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Navn Navnesen, CEO of Wavefoil

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

Gabriel Walton
Technical Director, Ultrabeam Hydrographic

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

Gabriel Walton, Technical Director, Ultrabeam Hydrographic

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Employees Section

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Håkon Baste

Chair of the Board

hb@norwegian-subsea.no

Håkon comes from a background at DNV GL where he worked with offshore and shipping consultancy as well as newbuilding supervision and quality assurance. Håkon joined Norwegian Subsea in 2014.

Chris Ruigrok

Sales Manager

cr@norwegian-subsea.no

Chris holds an MSc in Aerospace Engineering and brings extensive commercial experience from the oil & gas, marine, and subsea technology sectors. His career has focused on the industrialisation and commercialisation of emerging technologies. Chris joined Norwegian Subsea in 2021.

Fredrik Dukan

CEO

fd@norwegian-subsea.no

Fredrik holds a PhD in Marine Cybernetics with focus on subsea navigation and ROV motion control systems. He previously held engineering positions at Aker and has broad experience from marine and subsea operations. Fredrik founded Norwegian Subsea in 2014.

Product Variant Section

a section of products variants

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 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.

Applications Section

Ship Motion Monitoring

Precise motion measurements are essential for vessel digitalisation, supporting fuel optimisation, route planning, cargo safety and structural health.

Dynamic Positioning

Dynamic positioning (DP) of vessels necessitates roll and pitch compensation of the GNSS antenna to ensure accurate positioning of the ship's control point.

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.

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Applications

Helideck Monitoring

Accurate measurement of roll, pitch, and heave motions is crucial for assessing the safety of helidecks during helicopter landing and take-off operations.

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Bridges

Accurate and high-resolution motion sensors are crucial for the structural monitoring of bridges.

Inclinometer

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±0.05°

Roll & Pitch accuracy

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Latest Faq

Can a Motion Reference Unit (MRU) be used for inclining tests?

What is the HS/commodity code for Norwegian Subsea MRUs?

Related Faq (MRU marine)

What is the HS/commodity code for Norwegian Subsea MRUs?

What are the MRU dimensions?

MRU Compact

What is the difference between the MRU Marine and MRU Marine SW?

What is the difference between the MRU Marine and MRU Marine SW?

What is an Attitude and Heading Reference System (AHRS)?

Attitude and Heading Reference System (AHRS)

What are the differences between marine motion sensors?

Understanding the Differences Between IMU, Inclinometer, Roll & Pitch sensor, VRU, AHRS, MRU, Gyrocompass, GNSS/INS

Manual FAQ

What is a Gyrocompass?

An inline question

Product Card Section

MRU Marine

Usage area

Heave accuracy

Roll & Pitch accuracy

Connectors

MRU Compact

Usage area

Heave accuracy

Roll & Pitch accuracy

Connectors

MRU Subsea

Usage area

Heave accuracy

Roll & Pitch accuracy

Connectors

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Ship Motion Monitoring

Dynamic Positioning

Subsea Surveys

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Applications

Helideck Monitoring

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