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The Marine Data MD71TMC is an advanced Transmitting Magnetic Compass (TMC) system engineered and manufactured in the United Kingdom by Marine Data Systems Ltd. Designed to meet IMO resolution A.817(19) requirements, the MD71TMC senses magnetic heading from a standard shipboard main or emergency magnetic compass and converts it into accurate digital NMEA 0183 serial heading data for transmission across vessel bridge networks, ECDIS systems, radar displays, and heading repeaters.
The system comprises the MD71TMC Control Unit paired with an external magnetic fluxgate pick-off sensor (e.g., MD73TMC coil unit) fitted directly to the vessel’s primary magnetic compass bowl. Featuring an intelligent auto-calibration routine and digital deviation table correction, the MD71TMC eliminates manual alignment errors and continuously monitors heading validity. A high-contrast OLED display on the main processing unit presents real-time digital heading, status diagnostics, and deviation offsets, while dual isolated NMEA 0183 outputs drive auxiliary navigation repeaters and steering systems.
Key Features:
• Magnetic-to-Digital Conversion: Converts standard mechanical magnetic compass bowl readings into high-precision digital NMEA 0183 serial heading sentences ($HEHDT, $HCHDG, $HCHDM).
• Intelligent Auto-Calibration Routine: Built-in semi-automatic deviation correction algorithm automatically calculates and compensates for vessel magnetic deviation.
• Dual Isolated NMEA 0183 Outputs: Dual optical-isolated NMEA serial ports allow simultaneous data transmission to ECDIS, RADAR, Autopilot, and remote heading repeaters.
• High-Contrast OLED Interface: Clear front-panel OLED screen provides live magnetic heading indication, system status, and intuitive menu-driven calibration.
• Off-Course & Fault Alarms: Integrated audible and visual alarms monitor magnetic compass signal integrity, power loss, and off-course threshold deviations.
| Attribute | Specification Details |
| Manufacturer | Marine Data Systems Ltd. |
| Model / Part Number | MD71TMC System (Control Unit P/N: MD71TMC) |
| Item Type | Transmitting Magnetic Compass (TMC) Processing System |
| Pick-Off Sensor | Fits external magnetic fluxgate pickup sensor (e.g., Marine Data MD73TMC coil) |
| Heading Accuracy | Signal processing accuracy ±0.1° (overall system accuracy dependent on magnetic compass bowl) |
| Heading Resolution | 0.1° digital resolution |
| Output Data Sentences | NMEA 0183 (IEC 61162-1): $HEHDT,$HCHDG, $HCHDM,$THS |
| Baud Rates | 4800 / 9600 / 19200 / 38400 baud (configurable per channel) |
| Outputs | 2 x Opto-isolated NMEA 0183 RS422 data outputs |
| Display Type | High-contrast red OLED graphic display (heading readout, status, & setup menu) |
| Illumination | Dimmable display backlighting via front-panel control |
| Operating Power Supply | Dual 24V DC input (18V to 32V DC) with automatic seamless failover switch |
| Power Consumption | Approx. 5W max |
| Alarms & Indicators | Internal audible buzzer + fail-safe relay alarm contacts for power loss & signal fault |
| Mounting Format | Panel flush mount (standard DIN cut-out) / Bulkhead mount enclosure |
| Enclosure Material | Marine-grade aluminum alloy with corrosion-resistant black powder coat finish |
| Dimensions | Approx. 144 mm (W) x 144 mm (H) x 96 mm (D) |
| Weight | Approx. 1.6 kg (3.53 lbs) |
| Operating Temperature | -25°C to +70°C (-13°F to +158°F) |
| Ingress Protection | IP54 front panel (wheelhouse console); IP66 optional weatherproof housing |
| Compliance & Standards | ISO 25862, ISO 8728, IEC 60945 (Marine EMC & Environmental), CE, Wheelmark (MED) |
| Application | Primary magnetic compass digitizer, secondary heading source for ECDIS/RADAR, back-up compass interfacing |
| Country of Origin | United Kingdom |
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