MD74RDI Digital Rudder Angle Indicator

The MD74RDI is a four digit digital Rudder Angle Indicator which accepts NMEA 0183 input, and is accurate to a resolution 0.1°


The MD74RDI is a four digit digital Rudder Angle Indicator which accepts NMEA 0183 input, and is accurate to a resolution 0.1°. It features a bar LED indicator to show Port or Starboard manoeuvres, along with 3 touch membrane buttons for setup.

The Rudder Angle Indicator can be panel mounted (kit included) or bulkhead mounted with an optional adjustable Trunnion Bracket. Internal components are housed within a robust aluminium enclosure.

Finished in RAL7040 Window Grey or RAL9005 Jet Black powder coat paint, the MD74RDI is designed to complement existing marine navigation equipment.
Compact and rugged, the MD74RDI 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 Rudder Angle Indicator from Marine Data: flexible in application, easy to install and simple to maintain.


  • Large Format LCD Digital Display to 0.1°
  • Bar LED to indicate Port and Starboard manoeuvres
  • NMEA 0183 Digital Input
  • Local and Remote Dimming Control Compatible
  • Panel Mounted or optional Bulkhead Mount
  • Wheelmark Approved when installed as part of a Marine Data Rudder Angle Indication System


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


MD74TB – Bulkhead Mounting Kit
MD74DIM – Remote Dimming Control


MD74RDI/W – Weatherproof Rudder Angle Indicator (IPX6)
The complete range of Marine Data Rudder Angle Indicators
MD61 – Rudder Angle Sensor Transmitter


  • 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 D-type data cable; M4 earth stud
  • Construction: Aluminium alloy enclosure
  • Finish: RAL9005 Jet Black, fine texture


  • 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: IP54
  • 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: RAL7040 Grey paint finish
  • Notice: The MD74RDI 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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