Motion Reference Unit

SMC Motion Reference Unit, MRU, is a high-performance motion sensor that measures Roll, Pitch, Heave, Sway, Surge, Accelerations, Angular rates and Velocity for any rig, ship or vessel on which it is mounted.

SMC is a producer of Motion Reference Units, MRU, which commonly are referred to as motion sensors and Vertical Reference Units, VRU.


• Roll & Pitch
• Heave
• Velocities
• Accelerations
• Serial and Ethernet communication
• Industry protocols NMEA

Motion reference unit product range

Motion Reference Unit IMU-10x IMU-10x
Roll and Pitch 0.03°
Heave 5 cm
Motion Reference Unit IMU-00x IMU-00x
Roll and Pitch 0.25°
Heave 5 cm

Model Roll/Pitch Heave
IMU-007 0.25° RMS N/A
IMU-008 0.25° RMS 5cm or 5%
IMU-106 N/A 5cm or 5%
IMU-107 0.03° RMS N/A
IMU-108 0.03° RMS 5cm or 5%
IMU-108-30 0.03° RMS 5cm or 5%

Motion Reference Unit applications

The SMC MRU is manufactured to meet the requirements of the Marine, Offshore oil and Gas industry and Hydrographic sector.

The SMC MRU is used in applications such as Dynamic Positioning DP, Active Heave Compensation AHC, Helideck Monitoring System and Met-Ocean systems. Other applications are motion monitoring where Roll, Pitch and Heave motions are measured on-board offshore platforms and vessels.

SMC Motion Testing Facilities

Demonstration of the SMC IMU Motion Reference Unit at SMC’s Factory Motion Testing Facilities. On our in-house six degrees of freedom Stewart Platform, the IMU Ranges can be proven with real Marine Motion data simulation making them the ideal units for Offshore Marine applications such as Helideck Monitoring, AHC, Dynamic Positioning, Hydrographic and all other Marine Motion Monitoring and compensation systems.