Inertial Labs


Motion Reference Units (MRU)

Show MRU MRU-B (Basic) MRU-E (Enhanced) MRU-P (Professional)
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Heave accuracy 5% / 5cm 5% / 5cm 5% / 5cm
Pitch & Roll dynamic accuracy 0.08 deg 0.08 deg 0.08 deg
Pitch & Roll post processing accuracy 0.03 deg 0.03 deg 0.03 deg
Linear acceleration accuracy 0.005 m/sec2 0.005 m/sec2 0.005 m/sec2
Heading dynamic accuracy 0.6 deg 0.4 deg
Heading post processing accuracy 0.1 deg 0.1 deg
Velocity accuracy 0.03 m/sec
Position accuracy 0.01 m + 1 ppm (RTK)
Gyroscopes Bias in-run stability 1 deg/hr 1 deg/hr 1 deg/hr
Accelerometers Bias in-run stability 0.005 mg 0.005 mg 0.005 mg
Interface RS-232, RS-422, RS-485
Output data format Binary, TSS-1, NMEA 0183 ASCII characters

The Inertial Labs has developed Motion Reference Units (MRU) to meet requirements from marine and hydrographic applications. MRU is enhanced, high-performance strapdown Motion Sensor, that determines Pitch & Roll, Heave, Sway, Surge, Ac celerations, Angular rates, Heading, Velocity and Positions for any device on which it is mounted. The Inertial Labs Motion Reference Units utilizes solid state 3-axes each of precision accelerometers, magnetometers, gyroscopes and barometric sensors to provide accurate Heave, Sway, Surge, Pitch and Roll of the device under measure.

Integration of very low noise gyroscopes output provides high frequency, real-time measurement of the Vessel, Ships, Helidecs, ROV, Marine antennas, Cranes rotation about all three rotational axes.

Through a combination of proven sector expertise and a continued investment in technological innovation, Inertial Labs delivers the optimum balance of price and performance ratio solutions for its customers.

Our MRUs featuring developed few micro g Bias in-run stability Micro Electro Mechanical System (MEMS)-based accelerometers. New generation of Inertial Labs 1 deg/hr Bias in-run stability MEMS-based gyroscopes are an ideal solution for demanding marine applications, with their electronic nature negating the problems associated with expensive mechanical gyro solutions, as well as those based on fiber optic (FOG) technology.

Inertial Labs MEMS gyroscopes set the standard for the industry, with our high-end MRUs featuring gyros that enable sector-leading accuracy and reliability standards.

Applications and customer cases:

  • State-of-the-art algorithms for Vessels, Ships, Active Heave Compensators, Cranes, Helideck, ROV, AUV, DPS, Buoys, Echo Sounders, Offshore Platforms
  • 0.08 deg RMS Pitch & Roll dynamic accuracy
  • 5% or 5 cm RMS (whichever is greater) Heave accuracy
  • 0.005 m/sec2 linear acceleration accuracy
  • NMEA 0183, TSS1 output data formats
  • HYPACK software compatibility
  • Velocity and Horizontal positions output
  • Environmentally sealed (IP67), compact design

Motion Reference Units key performance

Heave accuracy @ 10 seconds wave


Heave accuracy @ 20 seconds wave


Pitch dynamic accuracy @ 20 sec wave


Roll dynamic accuracy @ 20 sec wave


MRU Heave, Pitch & Roll dynamic testing

Gyroscopes & Accelerometers Bias in-run stability



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(858) 454-4044


7416 Cabrillo Avenue, La Jolla, CA  92037, United States