The MD74RDI/W from MARINE DATA is a waterproof (IP65) four digit LCD Rudder Angle Indicator with LED Bar Indicator.


The MD74RDI/W from MARINE DATA is a waterproof (IP65) four digit LCD Rudder Angle Indicator with LED Bar Indicator. It accepts a NMEA 0183 digital input from a MARINE DATA MD61 Rudder Angle Transmitter via a MARINE DATA MD94DDU Data Distribution Unit. The Rudder Angle Indicator digital display gives a resolution to 0.1° and is accurate to 0.1°. In addition to the digital display, it has a bar LED indicator to show Port or Starboard manoeuvres.

The Rudder Angle Indicator can be panel mounted (kit included) or bulkhead mounted with an optional adjustable Trunnion Bracket (MD74/TB). Internal components are housed within a robust aluminium enclosure. The MD74RDI/W is rated to IP65; an IP54 version (MD74RDI) is also available.

Finished in RAL7040 Window Grey or RAL9005 Jet Black powder coat paint, the MD74RDI/W is designed to complement existing marine navigation equipment.

Compact and rugged, the MD74RDI/W offers a Rudder Angle Indicator solution for locations where available space is limited and allows digital Rudder Angle data to be conveniently displayed at any location on a vessel.

The MD74RDI/W from MARINE DATA: flexible in application, easy to install and simple to maintain.


  • Compact digital display of Rudder Angle
  • Port and Starboard turn indication
  • Weatherproof to IP65; IP54 version available
  • Wheelmark Approved when installed as part of the MARINE DATA Rudder Angle Transmission and Indication System


  • Displays Rudder Sensor Angle Data transmitted from NMEA 0183 (IEC 61162-1) compatible equipment


Rudder Angle Transmission System


  • Weight: 1.0 kg
  • Dimensions: H 137 mm; W 250 mm; D 57 mm; Fascia: 192 x 97 x 6 mm
  • Mounting: Panel Mount or optional Bulkhead Bracket
  • Connections: 2.5 m captive data cable; M4 earth stud
  • Construction: Aluminium alloy enclosure
  • Finish: RAL7040 Window Grey


  • Power Supply: 24 V dc (18-32 V) 10 W max
  • Data input: Digital RS422 / RS485; NMEA 0183; 4800 Baud
  • Data sentence: RSA ($–RSA,x.x,A,x.x,A*hh)
  • Dimming: 0-24 V dc (with respect to supply negative)


  • Performance: ± 0.1° accuracy
  • Display: Digital Display to 0.1°, Port and Starboard indication
  • Error Indication: Loss of valid data: Display flashes


  • IP Rating: IP65
  • Operating temp: -15°C to +55°C
  • Compass: Safe Distance 50 cm


  • Compliancy with: IEC60945;IEC61162-1;ISO20673
  • RoHS: Compliant
  • Type Approval: Germanischer Lloyd (GL); Wheelmark Approved as part of the MARINE DATA RDI System


  • Supplied: Panel Mounting Kit
  • Option: RAL9005 Jet Black paint finish; fine texture
  • Notice: The MD74RDI-W is only to be used with a Type Approved Rudder Angle Indicator System in accordance with ISO 20673
  • Accessory: Bulkhead Mounting Kit

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