MD69BR/BO Bearing Compass Repeater Bowl Only

A Bearing Repeater Bowl to fit all Marine Data Systems’ standard mounting options, or for flush surface mounting.


The MD69BR/BO is a dual scale NMEA-based heading repeater available as a bowl-only option, ideal for retrofit, replacement or panel mounting. 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 suitable location on a vessel.

Finished in grey to complement external marine navigation equipment.

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


  • IPX6 Weatherproof Marinised Bearing Repeater Bowl
  • Dual scale 36:1 precision concentric dial display
  • Balanced for taking bearings using our optional sights
  • 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
  • Type Approval by DNVGL


  • Is the standard MD69 bearing repeater bowl that mounts into the MD69BR Trunnion, Bulkhead Bracket, or Pelorus stand
  • Repeats the heading display of a ship’s magnetic or gyro compass at a convenient location on a vessel
  • Allows celestial and terrestrial bearings to be taken when used in conjunction with the MD69AZI Azimuth Sight or the MD69BC Bearing Circle. The MD60A2K Telescopic Alidade is recommended for making detailed azimuth measurements


  • 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


  • MD69BR – Trunnion Mounted Bearing Compass Repeater
  • MD69/21 – Pelorus Stand Assembly with Bearing Compass Repeater
  • MD69/22 – Bulkhead Mounted Bearing Compass Repeater


  • Weight: 7.0kg (optimally balanced for Azimuth Sight)
  • Dimensions: H 127mm W 271mm; Body Ø 246mm; Outer dial Ø 185mm; Inner dial Ø 95mm; Verge ring 20mm (visible)
  • Mounting: 2x bearings internal Ø 8mm; distance between bearings 272mm
  • Mounting options: Gimbal & Trunnion; 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: 24V dc 8W nominal (22-31V dc)
  • Data input: RS422 NMEA 0183; 4800 Baud; others available
  • Data sentences: HDT, HDG and HDM; selected in descending order of priority
  • Cable: 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)


  • Supplied: Bowl only, with 2.5m captive cable. Mountings and junction boxes are optional extras

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