MD74HR/W Weatherproof Digital Compass Repeater Display

Weatherproof Digital Heading Repeater with LCD display & high visibility LED Turn Indicator, capable of displaying Rate Of Turn or Course To Steer.


The MD74HR/W is the weatherproof version of the MD74HR NMEA-based heading repeater with an LCD display. Digital heading data (ship’s heading) may be conveniently displayed at any location on a vessel. The MD74HR/W features a high visibility LED Turn Indicator which can display either Rate of Turn or Course to Steer.

Compact and rugged, the MD74HR/W offers a heading repeater solution for locations where the available space is limited and may be either bulkhead or panel mounted. Finished in jet black to complement other marine navigation equipment.

The MD74HR/W Heading Repeater from Marine Data: compact and rugged, flexible in application, easy to install and simple to maintain.


  • Back-lit LCD Heading Display and Heading Type with red tint
  • High visibility red LED Turn Indicator
  • Environmentally Protected to IPX6
  • No internal moving parts
  • NMEA 0183 Digital Input
  • Automatic selection and prioritisation of NMEA heading data type
  • Automatic warning of loss of valid heading data
  • Automatic detection of previously lost heading data without requiring a reset
  • True / Magnetic Source Indication
  • Rugged Construction
  • Local Dimming Control


Repeats the heading display of a ship’s magnetic or gyro compass at any convenient location on a vessel


  • MD74TB – Bulkhead Mounting Kit
  • MD74DIM – Remote Dimming Control


  • MD74HR – Digital Heading Repeater (IP54)
  • MD75HR – Large Format Digital Heading Repeater
  • MD71HR – Compact Digital Heading Repeater
  • The complete range of Marine Data Heading Repeaters
  • Transmitting Heading Device (THD) System (TMC and EMC)


  • Weight: 1.0 kg
  • Dimensions: H 137 mm; W 250 mm; D 78 mm (on bracket)
  • Fascia: 192 x 97 x 6 mm
  • Mounting: Panel mounted or Bulkhead mounted
  • Connections: 1 x 5-way screened captive cable
  • Construction: Aluminium alloy enclosure
  • Finish: RAL9005 Jet Black, fine texture


  • Power Supply: 24 V dc nominal; 4 watts max; 18-32 V dc
  • Data input: RS422 NMEA 0183; 4800 Baud; others available
  • Data sentences: THS, HDT, HDG and HDM; detected on start‐up in descending order of priority
  • Cable: 2.5 m multicore data cable with D-sub connector to bare tail


  • Performance: ± 0.1° resolution
  • Follow-Up Rate: >20° per second
  • LCD Display: Numeric Heading Data with Heading Type
  • LED Display: Visual Turn Indicator (24 segments)
  • Resolution: LCD Display ±0.1°, LED Turn Indicator: 1°
  • Illumination: LCD Backlight: Red tint; LED Display: Red; variable dimming
  • Error Indication: LCD display flashes at 1 Hz whilst showing the last known good heading (alert condition)


  • IP rating: IPX6 (IP54 option available)
  • Operating temp: -15°C to +55°C
  • RoHS: Compliant
  • Compass: Safe Distance 50 cm


  • Conforms with: IEC 60945; IEC 62288
  • Type Approval: Germanischer Lloyd (GL)


  • Supplied: Panel Mounting Kit
  • Panel cut-out: 175 x 85 mm
  • Panel holes: 4 x M4; 182 x 87 mm centres
  • Option: Bulkhead Mounting Kit
  • Option: Custom Paint Finish
  • Option: Remote Dimming

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