MRU Ex
The MRU Ex is a compact and cost-effective solution for hazardous areas including all Ex certificates
MRU Ex
The MRU Ex is a compact and cost-effective solution for hazardous areas including all Ex certificates
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
The MRU Ex is a cost-effective solution for hazardous areas. Easy to install with pigtail cable and including all certificates and documentation.
• Ex certificate II 2 G Ex d lIC Gb
• Compact and cost effective unit
• Stainless steel unit
• Ethernet & serial line
• Including pigtail cable in custom lengths
The MRU Ex comes in three different versions: 3000, 6000 and 9000 models to accommodate for different accuracy requirements and budgets.
The MRU Ex is also available in an inclinometer version of the MRU that does not include Heave/Surge/Sway outputs.
High accuracy roll, pitch and heave, even in irregular sea states
Ex certificate II 2 G Ex d lIC Gb
Low weight and small footprint enable installation almost anywhere
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.
Read more about the MRU ConfiguratorAvailable in the 3000, 6000 and 9000 series
0.05° (3000 series)
0.02° (6000 series)
0.01° (9000 series)
RMS (dynamic)
5.0 cm or 5.0 %
Whichever is greater for 0 to 25 s periods, valid for irregular motions in real sea conditions
Ethernet & RS-232 / Ethernet & RS-485
TCP, UDP, Modbus TCP, ethernet/IP, serial, Modbus RTU
NMEA, ASCII, Binary TSS1, MDL, Atlas, Simrad EM 3000, NORSUB, Custom, etc. ++ / See protocol list
0-100 Hz
Pigtail cable - 16 wires
10 m / 25 m / custom length
II 2 G Ex d IIC Gb
190 x 190 x 205 mm
19 kg (excluding cable)
AISI 316L
Operating: -20 to +40 °C
Storage: -40 to +85 °C
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.
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.
Norwegian Subsea has returned from a successful trip to Shanghai, where our compact Motion Reference Units (MRUs) drew strong interest from across the Chinese maritime supply chain during the Marintec China 2025 exhibition. As one of the world’s leading maritime events, Marintec provided an ideal platform to engage with shipbuilders, integrators and equipment manufacturers in a region where innovation and scale go hand in hand.