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Gyro Compass MGC R3 for ships / high-speed crafts


The MGC R3 is type approved as gyro compass for navigation purposes. Very high reliability is achieved using Ring Laser Gyros.

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Type approved compass for ships and high-speed crafts

The MGC R3 COMPASS system is IMO type approved as gyro compass for navigation purposes for use together with a heading and bearing repeater. Very high reliability is achieved by using Ring Laser Gyros with no rotational or mechanical wear-out parts.


Customer experience with MGC
Click to read one customers experience.

The MGC is a strap-down based gyro compass including three Ring Laser Gyros (RLG) and three linear accelerometers. The system can operate in Attitude and Heading Reference System (AHRS) mode and Inertial Navigation mode. In the AHRS mode input of speed and latitude data (VBW/VTG and GGA/GLL) is required. External time input is also required (ZDA). In this mode the system will output heading, roll, pitch and heave. In the Inertial Navigation mode input of latitude, longitude, height and time (GGA and ZDA) and PPS from a GNSS receiver is required. In this mode the product will output heading, roll, pitch, heave and position.

The system is delivered with Windows based configuration software, MRC+. In this software the user selects output formats on the different communication lines in addition to other configuration purposes.

The MGC R3 compass and distribution boxes.

Digital I/O protocols

MGC data is available through both Ethernet interface and serial lines enabling easy distribution of data to multiple users on board the vessel. Output protocols for commonly used equipment are available on five individually configurable serial lines and five Ethernet/UDP ports.


  • No rotational or mechanical wear-out parts
  • 0.08° heading accuracy with GNSS aiding
  • Outputs on RS-232, RS-422 and Ethernet
  • High output data rate (200 Hz).
  • Small size, light weight and low power consumption
  • 2-years warranty
  • Each MGC delivered with Calibration Certificate
  • Selectable communication protocols in the Windows based configuration software, MRC+

Typical applications

The system can be operated as an inertial navigation system as well as a gyro compass with output of position and heading. Linear position and velocity measurements can then be output in up to four different points on the vessel.

Technical specifications

MGC R3 compass configuration
Typical MGC R3 compass configuration drawing

Heading output

  • Accuracy heading (GNSS aided): 0.08° RMS sec.lat
  • Heading settling time (typical): 17 min from start-up
  • Resolution: 0.1°

Roll and pitch output

  • Output range: ±90°
  • Resolution: 0.001°
  • Angular rate noise: 0.010°/s RMS
  • Accuracy: 0.01° RMS

Heave output

  • Output range: ±50 m, adjustable
  • Periods (real-time): 0 to 25 s
  • Periods (delayed): 0 to 50 s
  • Heave accuracy (real-time): 5 cm or 5% whichever is highest
  • Heave accuracy (delayed): 2 cm or 2% whichever is highest

Position output

  • Free inertial: 5 nm/hr


  • Power requirements: 24V DC, Max. 13 W
  • COM1 through COM4: Serial port, bidirectional RS-422/IEC 61162
  • COM5: Serial port output RS-422 and PPS port input RS-422
  • Baud rate max.: 115200 Baud
  • Ethernet UDP/IP (5 ports): 10/100 Mbps
  • Output data rate (max): 200 Hz
  • Timing accuary: 1 ms

Operating temperature

  • Sensor unit: -5 to +55°C
  • MGC junction box: -15 to +55°C
  • Repeater junction box: -5 to +55°C


  • Sensor unit: Sealed
  • MGC junction box: IP 54
  • Repeater junction box: IP 54

Dimensions (HXLXW)

  • Sensor unit: 188.9x189.5x189.5 mm
  • MGC junction box: 57.1x236x146 mm
  • Repeater junction box: 57.1x115x104 mm

Other data

  • MTBF (computed): 50 000 h

Input formats

  • NMEA sentences GGA, GLL, VBW, VTG, ZDA

Output formats

  • NMEA sentences GGA, GLL, VTG, HCR, HDT, ROT, THS

Related publications (PDF)


An introduction to the Motion Gyro Compass. Users talk about their experience using the MGC.

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