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The Marine Data MD77RDI is a compact, NMEA-based analog dial Rudder Angle Indicator manufactured in the United Kingdom by Marine Data Systems Ltd. Built for wheelhouse consoles and steering stations where clear visual feedback of rudder position is essential, it features a 118 mm diameter analog dial graduated in 1° increments from 45° Port to 45° Starboard.
Housed in a compact aluminum alloy enclosure finished in Jet Black (RAL9005) fine-texture powder coat, the unit decodes standard digital RS422 NMEA 0183 Rudder Sensor Angle ($RSA) sentences from compatible transmitters such as the Marine Data MD61. It includes touch-panel dimmer controls for background and pointer illumination alongside remote dimmer support, automatic signal-loss alert indication, and auto-recovery without requiring a manual reset.
Key Features:
• Clear 118 mm Analog Dial: High-contrast dial graduated in 1° increments across a 45° Port to 45° Starboard scale with ±0.5° accuracy and a 40°/sec follow-up rate.
• Touch Panel & Remote Dimming: Fitted with front touch-panel controls for background and pointer illumination, plus support for remote dimmer control (MD01/PMD).
• Automatic Signal-Loss & Recovery Alert: Moves the pointer to a vertical upward position with a flashing red LED alert upon loss of valid $RSA data, and automatically resumes operation once valid data returns without a reset.
• Universal NMEA 0183 Interfacing: Accepts digital RS422 NMEA 0183 ($RSA) sentences at 4800 baud, with an optional NMEA 0183 output for daisy-chaining repeater displays.
• Flexible Console or Bulkhead Installation: Supplied with a panel mounting kit for 140 mm square cut-outs, or bulkhead-mounted using the optional MD77TB bracket kit; two units can be paired for dual-rudder vessels.
| Attribute | Specification Details |
| Manufacturer | Marine Data Systems Ltd. |
| Model / Part Number | MD77RDI (SKU: F077202) |
| Item Type | Analog Dial Rudder Angle Indicator |
| Display Type | 118 mm diameter analog dial with backlit white illumination |
| Scale Range & Graduation | 45° Port to 45° Starboard (0–40°/45° full-scale deflection), graduated in 1° increments |
| Performance | ±0.5° accuracy; 40°/sec follow-up rate; 30,000 hours MTBF |
| Data Inputs | Digital RS422 NMEA 0183 (IEC 61162-1) at 4800 baud ($–RSA sentence) |
| Data Outputs | Optional NMEA 0183 ($RSA) output for daisy-chaining repeater displays |
| Illumination & Dimming | Backlit white illumination with touch-panel dimmer control & remote dimmer support (0–24V DC) |
| Error Indication | Loss of valid data: pointer assumes vertical upward position + flashing red LED alert; auto-recovery without reset |
| Operating Power Supply | 24V to 28V DC (10W max) |
| Connections | 1 x 2.5 m multi-core data cable terminated in a 15-pin D-sub plug |
| Mounting Format | Panel flush mount (140 x 140 mm square cut-out; kit supplied) or Bulkhead mount (optional MD77TB bracket kit) |
| Enclosure Material | Aluminum alloy enclosure with RAL9005 Jet Black fine-texture powder coat finish |
| Dimensions | Fascia: 144 mm (W) x 144 mm (H) x 6 mm (D); On bracket: 200 mm (W) x 166 mm (H) x 87 mm (D) |
| Weight | 1.25 kg (2.76 lbs) on bracket |
| Compass Safe Distance | 100 cm (Magnetic Permeability: Category ‘A’) |
| Operating Temperature | -15°C to +55°C (Storage: -25°C to +70°C) |
| Ingress Protection | IP54 |
| Compliance & Standards | IEC 60945, IEC 61162-1, IEC 62288, ISO 20673, IMO Res. A694(17), A1021(26), MSC191(79), RoHS compliant, DNV GL Wheelmark Approved (as part of Marine Data RDI System) |
| Application | Wheelhouse console rudder angle indicator; supports dual-unit installation for twin-rudder vessels |
| Country of Origin | United Kingdom |
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