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Gyro Compass MGC R2 for ships / high-speed crafts

MGC R2 Compass

MGC R2 Compass

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The MGC R2 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.

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.


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.

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.

Features MGC R2 Compass

  • 0.02° roll and pitch accuracy
  • 0.2° secant latitude heading accuracy
  • No rotational or mechanical wear-out parts
  • Outputs on RS-422 and Ethernet
  • High output data rate (200 Hz)
  • Small size, light weight and low power consumption
  • IMO type approved
  • Each MGC delivered with Calibration Certificate
  • Selectable communication protocols in the Windows based configuration software, MRC+

Technical specifications

Heading output

  • Accuracy heading: 0.15° RMS sec.lat
  • Accuracy heading (GNSS aided): 0.1° RMS sec.lat
  • Heading settling time to data available: < 5 min from start-up
  • Heading settling time to full accuracy (typical): 17 min from start-up
  • Resolution: 0.01°

Roll and pitch output

  • Output range: ±90°
  • Resolution: 0.001°
  • Angular rate noise: 0.020°/s RMS
  • Accuracy: 0.02° 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: 20 nm/hr


  • Voltage input: 24 V DC (nominal (18 to 32 V DC)
  • Power consumption: Max. 13 W (typical 11 W)
  • COM1 through COM4: Serial port, bidirectional RS-422/IEC 61162-1 and IEC 61162-2
  • COM5: Serial port output RS-422 and PPS port input RS-422 electrical levels
  • Baud rate: Max. 115200 Baud
  • Ethernet UDP/IP (5 ports): 10/100 Mbps
  • Output data rate (max): 200 Hz
  • Timing accuary: 1 ms

Input formats

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

Output formats


Other data

  • MTBF (computed): 50 000 h
  • MTBF (service history based): 100 000 h

Weights and dimensions

  • Sensor unit: 188.9 x 189.5 x 189.5 mm, 8 kg
  • MGC junction box: 57.1 x 236 x 146 mm, 2 kg
  • Repeater junction box: 57.1 x 115 x 104 mm, 0.5 kg

Operating temperature range

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

Storage temperature range

  • Sensor unit: -25 to +70°C
  • MGC junction box: -25 to +70°C
  • Repeater junction box: -25 to +70°C

Enclosure protection

  • Sensor unit: IP 66
  • MGC junction box: IP 54
  • Repeater junction box: IP 54

Related publications (PDF)

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