How do I select the best Norwegian Subsea product for me?
At Norwegian Subsea, we design all our Motion Reference Units (MRUs) for high performance, reliability, and cost-effectiveness, making the 'best' product dependent on your specific application requirements and operating environment. Our sensors utilize advanced algorithms and state-of-the-art MEMS technology, validated in real sea conditions to ensure robust and accurate 6DoF motion data (Roll, Pitch, Heave, Yaw, Surge, Sway).
Our core MRU range includes the MRU Compact (IP65, anodized aluminum, RJ45/RJ50 connectors with passive PoE) ideal for indoor or control box installations; the MRU Marine (IP68 or 50m SW option, anodized aluminum, versatile pigtail/Subconn connectors) designed for deck mounting or shallow water; the MRU Subsea (6000m depth-rated, titanium housing, Subconn connector) for deepwater applications like ROV/AUV operations and riser monitoring; and the MRU Ex (Ex d certified, stainless steel housing, pigtail cable) for hazardous area installations.
All models are designed for easy integration with standard protocols (Ethernet UDP, Modbus TCP, Ethernet/IP, RS-232/485 options) and user-friendly web-based configuration. They are compact, can be mounted in any orientation, and typically do not require recalibration, reducing lifetime costs. We offer different accuracy tiers (±0.05°, ±0.02°, ±0.01° Roll/Pitch) across these models, allowing you to select the optimal balance of performance and budget.
Ultimately, the best Norwegian Subsea MRU is the one that precisely matches your technical needs, environmental conditions, and integration requirements, delivering trusted motion data reliably and affordably.
Related products
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%
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
6000 m depth
Connectors
SubConn 8
Roll & Pitch accuracy
- 3000±0.05°
- 6000±0.02°
- 9000±0.01°
Heave accuracy
5 cm or 5.0%
Usage area
Hazardous areas
Connectors
Pigtail cable
Roll & Pitch accuracy
- 3000±0.05°
- 6000±0.02°
- 9000±0.01°
Heave accuracy
5 cm or 5.0%
Further reading
Advanced motion compensation for sonars introduced at Ocean Business 2025
MRUs for vessel performance optimisation in focus at Europort 2025
Research Project to Test Value of MRU Data for Vessel Performance and Carbon Reduction
Related questions
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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.
Gyrocompass
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The MRU Compact uses a standard RJ45 ethernet cable where power is supplied through Passive PoE (Power over Ethernet). In most cases you cannot connect the MRU directly to a an ethernet switch with PoE, since most of these are Active PoE.
We normally supply your first MRU Compact with a start kit containing a POE RJ45 spliter socket. You will only need standard RJ45 cat5 ethernet cables to connect the MRU to the spliter socket and the spliter socket to your PC or ethernet switch.
Related applications
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