Motion Reference Unit

MRU 2, the fifth generation roll and pitch motion sensor, is designed for high accuracy roll and pitch measurements in marine applications. This unit, which must be fixed in a specific direction relative to the ship, is particularly suited for applications with a limited roll and pitch range. It is essential for many uses such as offshore riser monitoring systems, dynamic positioning systems, telecommunication antenna systems, and motion damping systems on high-speed crafts.

Advanced Sensing Functionality

Boasting two highly precise accelerometers and MEMS angular rate gyros, MRU 2 is distinguished for its reliability that stems from solid state sensors without rotational or mechanical parts prone to wear. It comes with Windows-based software for configuration and data presentation. When positioned high up in a ship, such as on the bridge, the MRU 2 outperforms inclinometers and standard Vertical Reference Units due to its capability to suppress horizontal accelerations affecting roll and pitch measurements.

Operational Design and Output

The MRU 2 outputs both static and dynamic roll and pitch angles, along with corresponding angular rate vectors. Furthermore, it delivers surge and sway accelerations. Offering digital I/O protocols, MRU data can be accessed via Ethernet interface and serial lines which enable the easy distribution of data to multiple users on board.

Key features

  • 0.10° roll and pitch accuracy
  • Outputs high accuarcy roll and pitch measurements
  • Suppression of horizontal acceleration when mounted off the vesselCenter of Gravity (CG)
  • Outputs on RS-232, RS-422 and Ethernet
  • High output data rate (200 Hz)
  • High reliability and no mechanical wear-out parts
  • Small size, light weight and low power consumption
  • Each MRU delivered with Calibration Certificate
  • Selectable communication protocols in the Windows based
  • MRU configuration software
  • 2-year warranty

Technical specifications


Roll/pitch Static RMS:
Roll/pitch Dynamic 1-sigma:

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