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The MD74HR is a compact NMEA-based digital heading repeater with an LCD heading display and a 24-segment LED turn indicator. The LED indicator can show Rate of Turn (ROT) or Course to Steer. It is suitable for repeating magnetic or gyro-compass heading at various locations on a vessel.
| Specification | MD74HR Details |
|---|---|
| Manufacturer | AMI Marine / Marine Data |
| Model | MD74HR |
| Equipment Type | Digital Compass / Heading Repeater |
| SKU / Product No. | MNE-0064 / F074021 |
| Application | Marine bridge navigation |
| Heading Display | Back-lit LCD |
| Heading Resolution | ±0.1° |
| Heading Display | Numeric heading with heading type |
| Turn Indicator | High-visibility red LED |
| LED Segments | 24 segments |
| LED Resolution | 1° |
| Turn Indicator Function | Rate of Turn or Course to Steer |
| Heading Source | True / Magnetic |
| Data Input | NMEA 0183 |
| Data Interface | Digital RS422 |
| NMEA Baud Rate | 4800 / 9600 / 19200 / 38400 Baud, auto-selecting |
| Supported NMEA Sentences | THS, HDT, HDG, HDM |
| Follow-up Rate | >20°/second |
| Power Supply | 24 V DC nominal |
| Input Voltage | 18–32 V DC |
| Power Consumption | 4 W maximum |
| LCD Illumination | Red tint, variable dimming |
| LED Illumination | Red, variable dimming |
| Error Indication | LCD flashes at 1 Hz while displaying last known valid heading |
| Mounting | Panel mount; bulkhead mounting with optional bracket |
| Dimensions | H 137 × W 250 × D 78 mm |
| Fascia | 192 × 97 × 6 mm |
| Weight | Approx. 1.0 kg |
| Construction | Aluminium alloy enclosure |
| Finish | Jet Black, RAL9005 |
| Operating Temperature | -15°C to +55°C |
| Compass Safe Distance | Standard 85 cm; steering 45 cm |
| Environmental Standard | IEC 60945 – Protected Area |
| Type Approval | DNV |
| Origin Country | United Kingdom |
| Optional Accessories | MD74TB Bulkhead Trunnion Mounting Kit; MD74DIM Remote Dimming Control |
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