The MRU 5 by Kongsberg Seatex / Kongsberg Discovery is a Motion Reference Unit for applications like multibeam echo sounder compensation, AHC cranes, hydroacoustic positioning systems, and dynamic positioning systems.
It outputs motion parameters (e.g., roll/pitch/heave, plus supporting dynamics such as linear acceleration and angular rate).
We compare the MRU 5 with the MRU 6000 Marine and MRU 3000 Marine
Available in the 3000, 6000 and 9000 series
Marine: IP68
Marine SW: 50 m water depth
Marine SW16: 50 m water depth
Marine: Lemo 16 pins
Marine SW: SubConn 8 pins
Marine SW16: SubConn 16 pins
NMEA, ASCII, Binary TSS1, MDL, Atlas, Simrad EM 3000, NORSUB, Custom, ++.
0-100 Hz
154 x 86 x 67 mm
1.2 kg
Marine Anodized Aluminum 6061-T6
Operating/Storage: -40 to +85 °C
Dutch company Radac is committed to delivering the most advanced wave radar systems that focus on the task of providing accurate, localised wave and seastate data. To support the highest levels of accuracy and reliability, Motion Reference Units (MRUs) from Norwegian Subsea are used as standard in its WaveGuide radar systems. This has helped build an enviable reputation for quality in the offshore industry, with Radac’s systems widely recognised for enabling confident decision-making in diverse and dynamic marine environments.
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.
From bathymetric surveys to subsea inspections and wave radar systems, our Motion Reference Units (MRUs) have been put to work in a wide range of challenging environments during 2025. As the year draws to a close we take a quick look back at some of the highlights, applications, and collaborations that helped shape another strong year of progress for Norwegian Subsea.