Do I need a junction box for the MRU Marine?
The MRU Marine uses a custom 16-wire cable with Lemo connectors.
The 16 wires provide full flexibility for both Ethernet, RS-232, RS-485, PPS time sync and Aiding input.
What connection options do I have for my MRU Marine?
- Pigtail cable only, that you terminate at your end.
- Junction box V2, that has standard connectors on the outside and uses a Lemo cable with connectors on both ends (Male for MRU side & Female for JB side)
- Lemo connector (for MRU connection)
- RJ45 (for Ethernet)
- Power input
- DB-9 connector for Time Sync
- DB-9 connector RS-485
- DB-9 connector for RS-232
- Junction box V3:
- Closed JB which is IP-68 rated and has 3 cable glands
- Ethernet connector inside for test and configuration use
- Termination blocks inside for all connections
- Pigtail cable for connection to MRU side
- This junction box can be used with both MRU Marine and MRU Marine SW
- The JB V3 has analog outputs, both Volt and Current, included
Related products
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%
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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What is a Motion Reference Unit (MRU)?
A motion Reference Unit (MRU) is a device that measures motion in all six degrees of freedom (DoF): roll, pitch, yaw & surge, sway and heave. The six DoF positions, velocities and accelerations are measured by the MRU using high-end gyroscopes and accelerometers (and sometimes magnetometers) and processed by advanced sensor fusion algorithms.
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