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The MD74HR/W is a weatherproof NMEA-based digital heading repeater with a back-lit LCD display and high-visibility LED turn indicator. It can display Rate of Turn (ROT) or Course to Steer and is designed for exposed locations on vessels. AMI Marine specifies sealing to IEC 60945 Exposed Area Classification.
| Specification | MD74HR/W Details |
|---|---|
| Manufacturer | AMI Marine / Marine Data |
| Model | MD74HR/W |
| Equipment Type | Weatherproof Digital Compass / Heading Repeater |
| SKU | MNE-0065 / F074031 |
| Application | Marine Bridge Navigation |
| Primary Function | Repeats ship’s magnetic or gyro compass heading |
| Display | Back-lit LCD, red tint |
| Heading Display Resolution | ±0.1° |
| Heading Type | True / Magnetic |
| Turn Indicator | High-visibility red LED |
| LED Segments | 24 segments |
| LED Resolution | 1° |
| Turn Indicator Function | Rate of Turn (ROT) / Course to Steer |
| Data Input | NMEA 0183 |
| Electrical Interface | RS422 |
| NMEA Data Sentences | THS, HDT, HDG, HDM |
| NMEA Baud Rate | 4800 Baud; other rates available |
| Power Supply | 24 V DC nominal |
| Input Voltage | 18–32 V DC |
| Power Consumption | 4 W maximum |
| Follow-up Rate | >20°/second |
| Error Indication | LCD flashes at 1 Hz while displaying last known valid heading |
| Dimming | Local dimming control |
| Mounting | Panel or bulkhead mounting |
| Dimensions | H 137 × W 250 × D 78 mm |
| Fascia | 192 × 97 × 6 mm |
| Weight | Approx. 1.0 kg |
| Construction | Aluminium alloy enclosure |
| Finish | Weatherproof Window Grey / RAL7040 |
| Protection | IPX6 / weatherproof; fully sealed for exposed-area installation |
| Operating Temperature | -15°C to +55°C |
| Compass Safe Distance | 50 cm |
| Standards | IEC 60945, IEC 62288, IEC 61162-1 |
| IMO Compliance | IMO Resolution A821(19) |
| Type Approval | Germanischer Lloyd (GL) |
| Accessories | MD74TB/W Bulkhead Trunnion Mounting Kit; MD74DIM Remote Dimming Control |
| Origin Country | United Kingdom |
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