What is the Norwegian Subsea motion reference unit?
A Norwegian Subsea Motion Reference Unit (MRU) is an advanced sensor system designed to accurately measure the motion of marine vessels, offshore structures, and subsea equipment in all six degrees of freedom (6DoF): Roll, Pitch, Yaw, Heave, Surge, and Sway. Our MRUs utilize state-of-the-art MEMS (Micro-Electro-Mechanical Systems) sensor technology combined with sophisticated sensor fusion algorithms to deliver precise and reliable motion data.
Norwegian Subsea MRUs are engineered for high performance and robustness, rigorously tested and validated in real sea conditions to ensure accuracy and dependability. We offer various accuracy levels across our product series (±0.05° for Series 3000, ±0.02° for Series 6000, and ±0.01° for Series 9000 Roll & Pitch), meeting diverse operational requirements. A key benefit is their long-term stability; our MRUs typically do not require recalibration during their operational lifetime for most applications, reducing maintenance needs and costs.
Designed for practicality, our MRUs are compact, lightweight, and can be mounted in any orientation, simplifying installation. Integration is straightforward thanks to support for a wide range of industry-standard communication protocols (including Ethernet UDP, Modbus TCP, Ethernet/IP, RS-232/485) and our free, user-friendly web browser interface for configuration (no software download required). This combination of high performance, reliability, and ease of use makes Norwegian Subsea MRUs a cost-effective solution for both new installations and retrofitting older systems.
We provide a comprehensive range of MRUs tailored to specific operating environments: the MRU Compact (IP65) for indoor or sheltered use, the MRU Marine (IP68/50m SW) for deck mounting or shallow water, the MRU Subsea (6000m Titanium) for deepwater applications, and the MRU Ex (Stainless Steel) for hazardous areas. Inclinometer/VRU versions are also available across the range for applications requiring only Roll and Pitch data.
