MRU Compact
The MRU Compact is a small-footprint unit with an easy installation process, supporting various communication protocols and featuring a dust and splash-proof design.
MRU Compact
The MRU Compact is a small-footprint unit with an easy installation process, supporting various communication protocols and featuring a dust and splash-proof design.
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 NORSUB MRU Compact is a small, yet accurate motion reference unit that is easy to install due to its passive Power over Ethernet (PoE) interface. A regular RJ45 Ethernet connector is used for both power and communication so that any cat5e cable can be connected. This makes installation fast and cabling costs low.
The MRU Compact is configured via Ethernet (TCP) and measurements data can be acquired from UDP messages, Modbus TCP or Ethernet/IP.
The MRU Compact dust and splash proof and is suitable for mounting indoors or inside a control box.
The MRU Compact comes in three different versions: 3000, 6000 and 9000 models to accommodate for different accuracy requirements and budgets.
The MRU Compact is also available in an inclinometer version of the MRU Compact that does not include Heave/Surge/Sway outputs.
High accuracy roll, pitch and heave, even in irregular sea states.
RJ45 or RJ50 connector with Passive Power over Ethernet (PoE) makes installation easy and cabling costs low.
Low weight and small footprint enable installation almost anywhere.
IP65
Marine Anodized Aluminum 6061-T6
120 x 57 x 53 mm
0.55 kg
Compact: RJ45 with passive POE
Compact RJ50: 10-pin RJ50 with passive POE
Compact: Ethernet
Compact RJ50: Ethernet & RS-232 / Ethernet & RS-485 / Ethernet & PPS
Compact: TCP, UDP, Modbus TCP, ethernet/IP
Compact RJ50: TCP, UDP, Modbus TCP, ethernet/IP, Serial, Modbus RTU
0-100 Hz
3000 series: 0.05°
6000 series: 0.02°
9000 series: 0.01°
RMS (dynamic & static)
5.0 cm or 5.0 %
Whichever is greater for 0 to 25 s periods, valid for irregular motions in real sea conditions
± 0.5 °
Magnetic heading
3000 series: ± 150 °/s
6000 series: ± 450 °/s
9000 series: ± 450 °/s
± 3 g (3000 series) / ± 4 g (6000 series) / ± 10 g (9000 series)
± 50 m
± 180 ° / ± 90 ° / ± 360 °
(no limits)
0 - 100 Hz
(adjustable output frequencies)
0.2 % max/min
3000 series: 0.050 °/s RMS
6000 series: 0.025 °/s RMS
9000 series: 0.015 °/s RMS
3000 series: 0.0025 m/s2 RMS
6000 series: 0.0020 m/s2 RMS
9000 series: 0.0015 m/s2 RMS
0.01 m/s2 RMS
6 W
9 - 36 V DC (24 V nominal)
32 GB
Custom NMEA, ASCII and Binary, Atlas, Gyrocompas 1, Ifremer Victor, MDL, NORSUB 1-8, Simrad EM 3000, SMCA, SMCC, Tokimek PTVG, RDI ADCP, TSS1 and many more.
Read more
GET/SET through telnet, serial port and MRU configurator.
Read more
Sync to host PC, Sync to NTP server, Sync to PPS
PPS time synchronization
Heading and velocity aiding
(on request)
Operating: -40 to +85 °C
Storage: -40 to +85 °C
IEC 60945/EN 60945
(immunity/emission)
IEC 60945/EN 60945
2000 m/s2 (half-sine 0.5 msec)
non-operational (10 ms peak)
100 000 h
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.
Precise motion measurements are essential for vessel digitalisation, supporting fuel optimisation, route planning, cargo safety and structural health.
Accurate measurement of vertical motion at the crane tip or winch is crucial for the operation of Active Heave Compensated (AHC) cranes and winches.
Accurate measurements of all 6 degrees of freedom are essential for the automatic motion control of gangways.
Dynamic positioning (DP) of vessels necessitates roll and pitch compensation of the GNSS antenna to ensure accurate positioning of the ship's control point.
Accurate measurement of roll, pitch, and heave motions is crucial for assessing the safety of helidecks during helicopter landing and take-off operations.
Stabilizing fin and roll damping systems rely on motion sensors to accurately measure the roll motions of a ship.
Over 1200 Norwegian Subsea Motion Reference Units are in operation world-wide on over 600 vessels, floating and subsea structures.
Some selected customer references.
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More than a month has passed since Oceanology International 2026, giving us time to reflect on the value of this major ocean technology and marine science event. For Norwegian Subsea, the London exhibition was defined by a wide range of conversations with both familiar and new faces, many of which are now developing into ongoing discussions across key marine and subsea applications.
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.
Motion Reference Units (MRUs) are crucial in wave radar technology, providing precise measurements of platform motion to accurately separate true wave patterns from a vessel's movements, therefore ensuring reliable data for maritime operations. However, before leading wave radar manufacturer Miros started working with Norwegian Subsea in 2016, it could be said that the MRU market was holding their potential back.