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The Marine Data MD97TMC is a standard-tier Transmitting Magnetic Compass (TMC) system manufactured in the United Kingdom by Marine Data Systems Ltd. Designed as a cost-effective, high-reliability solution for commercial vessels, fishing fleets, and workboats, the MD97TMC samples magnetic heading directly from the vessel’s primary magnetic compass and converts it into digital NMEA 0183 serial heading data.
The system consists of the MD97TMC processing unit and an external magnetic fluxgate sensor coil (e.g., MD73TMC) mounted on the main magnetic compass bowl. It eliminates manual heading logging by digitizing magnetic heading to drive bridge equipment, including ECDIS, radar displays, autopilots, and heading repeaters. The unit features semi-automatic deviation correction algorithms, LED status indicators, and opto-isolated serial outputs to ensure stable heading transmission across shipboard networks.
Key Features:
• Magnetic-to-Digital Interfacing: Digitizes standard mechanical magnetic compass bowl readings into NMEA 0183 serial heading sentences ($HCHDT, $HCHDG, $HCHDM).
• Standard Deviation Compensation: Built-in alignment and semi-automatic calibration routines compensate for shipboard magnetic deviation.
• Isolated NMEA 0183 Serial Output: Opto-isolated NMEA serial data port drives downstream navigation receivers, autopilots, and heading repeaters.
• Compact DIN Processing Module: Small-footprint panel enclosure enables straightforward installation into wheelhouse instrument consoles.
• Signal & Power Monitoring: Visual LED indicators provide immediate confirmation of power status, fluxgate signal lock, and NMEA data transmission.
| Attribute | Specification Details |
| Manufacturer | Marine Data Systems Ltd. |
| Model / Part Number | MD97TMC System (Control Unit P/N: MD97TMC) |
| Item Type | Standard Transmitting Magnetic Compass (TMC) Processing System |
| Pick-Off Sensor | Fits external magnetic fluxgate pickup sensor coil (e.g., Marine Data MD73TMC) |
| Heading Accuracy | Processing signal accuracy ±0.2° (overall system accuracy depends on magnetic compass bowl) |
| Heading Resolution | 0.1° digital resolution |
| Output Data Sentences | NMEA 0183 (IEC 61162-1): $HCHDT, $HCHDG,$HCHDM |
| Baud Rates | 4800 / 9600 baud (selectable) |
| Outputs | 1 x Opto-isolated NMEA 0183 RS422 serial data output |
| Display / Indicators | LED status indicators (Power, Signal Lock, NMEA Data Transmit) |
| Operating Power Supply | 24V DC nominal (18V to 32V DC range) |
| Power Consumption | Approx. 3.5W max |
| Mounting Format | Panel flush mount / DIN-rail / Bulkhead bracket mount |
| Enclosure Material | Marine-grade aluminum alloy enclosure with black powder coat finish |
| Dimensions | Approx. 144 mm (W) x 96 mm (H) x 75 mm (D) |
| Weight | Approx. 1.1 kg (2.43 lbs) |
| Operating Temperature | -25°C to +70°C (-13°F to +158°F) |
| Ingress Protection | IP54 front panel (wheelhouse console mounting); IP66 optional enclosed housing |
| Compliance & Standards | ISO 25862, IEC 60945 (Marine EMC & Environmental), CE |
| Application | Standard magnetic compass digitizer, secondary heading source for radar/ECDIS, back-up steering reference |
| Country of Origin | United Kingdom |
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