MD69BR/GP2 Bearing Repeater Bowl Retrofit with Gimbal Pin

The MD69BR/GP2 is a bearing repeater bowl, intended to retrofit into third party gimbal pin mounts.


The MD69BR/GP2 from MARINE DATA is a dual scale NMEA-based heading repeater available as a bowl-only option, ideal for retrofit or replacement. 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.

As a retrofit solution for third party gimbals, the MD69BR/GP2 offers a bearing repeater solution for most locations and may be bulkhead, surface or stand mounted. Finished in grey to complement other external marine navigation equipment.

The MD69BR/GP2 Bearing Repeater from MARINE DATA: flexible in application, easy to install and simple to maintain.


  • Fits a range of third party gimbals; contact MARINE DATA for details
  • 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


  • 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


  • Weight: 7.0 kg (optimally balanced for Azimuth Sight)
  • Dimensions: H 127 mm W 275 mm; Body Ø 246 mm; Outer dial Ø 185 mm; Inner dial Ø 95 mm; Verge ring 20 mm (visible)
  • Mounting: Third party gimbal ring
  • 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: 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 2.5 m captive cable. Mountings and junction boxes are optional extras