MD69BR Trunnion Mount Bearing Repeater Compass

A gimballed dual scale 36:1 precision Bearing Repeater designed for taking celestial and terrestrial bearings

MD69BR Trunnion Mount Bearing Repeater Compass

The MD69BR Bearing Repeater Compass is a dual scale NMEA 0183 based heading repeater designed for taking celestial and terrestrial bearings. Equipped with a 36:1 precision dual scale compass card display. Digital heading data (ship’s heading) may be conveniently displayed at any location on a vessel.

With a range of mounting options and accessories, the MD69BR offers a bearing repeater solution for every location and may be bulkhead, surface or pelorus stand mounted. Finished in RAL7040 window grey to complement other external marine navigation equipment.

The MD69BR Bearing Repeater Compass from Marine Data: Flexible in application, easy to install and simple to maintain.

Special Features

  • Dual scale 36:1 precision concentric dial display
  • Gimballed and balanced for optimal taking of bearings using the optional MD69AZI Azimuth Sight
  • Automatic selection and prioritisation of NMEA heading data type
  • Automatic warning of loss of valid heading data
  • Automatic detection of a previously lost heading data type without requiring a reset
  • True / Magnetic Source Indication
  • Local and Remote dimming control



  • MD69AZI – Azimuth Sight with sun filters, Thomson Pattern – Product F069051
  • MD69BC – Bearing Circle with sighting vanes and shadow pin – Product F069052
  • MD60A2K – Precision Telescopic Alidade – Product F060001

Technical Specifications


  • Weight: 7.0 kg (optimally balanced for Azimuth Sight)
  • Dimensions: H 164mm W 325mm; Body Ø 246 mm Outer dial Ø 185 mm; Inner dial Ø 95 mm Verge ring 20 mm (visible)
  • Mounting: Gimbal & Trunnion (standard); Pelorus Stand and Bulkhead Bracket options available
  • Connections: Multicore cable through watertight gland
  • Construction: Aluminium alloy enclosure
  • Finish: RAL7040 Window Grey, semi-gloss


  • Power Supply: 24 V dc 8 W nominal (22-31 V dc)
  • Data input: RS422 NMEA 0183; 4800 Baud; others available
  • Data sentences: HDT, HDG and HDM; selected in descending order of priority
  • Cable: 2.5 m multicore data cable tail


  • Performance: ± 0.01° resolution
  • Follow-Up Rate: 20° per second
  • Gimbal Action: ±45° pitch and roll
  • Display: Dual scale 36:1 rotating dial display
  • Heading LEDs: Blue = True Heading; Yellow = Magnetic Heading
  • Resolution: Outer scale marked at 1°, 5°, 10° & 45°; Inner scale marked at 0.1° & 1°
  • Illumination: LED array with local & remote dimming control; red tint
  • Error Indication: Loss of valid data: Dial oscillates ±35° about the last known good heading; dial illumination flashes


  • IP rating: IP67
  • Operating temp: -25°C to +55°C
  • Shock: STANAG 4549 – NS (0.03; 3.0; 300)
  • Vibration: MIL-Std-167-1A / IEC 60945
  • EMC: MIL-Std-461E / IEC 60945
  • Thermal: MIL-Std-810F / IEC 60945
  • Noise: MIL-Std-1474D <= 53 dB
  • Compass: Safe Distance 100 cm


  • Type Approval: Germanischer Lloyd (GL)

Additional Information

  • Supplied: MD69CB/W IP65 rated waterproof terminal box