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The Marine Data MD71THD is an advanced digital display head unit manufactured in the United Kingdom by Marine Data Systems Ltd. Designed as the primary user interface and control processing unit for Transmitting Magnetic Compass (TMC) and Electro-Magnetic Compass (EMC) systems, the MD71THD processes heading data derived from magnetic fluxgate pick-off sensors, magnetic compasses, and shipboard gyrocompasses.
The unit features a high-contrast red OLED screen displaying real-time digital heading with 0.1° resolution, system operating status, sensor selection, and alignment calibration menus. Built into a compact DIN-standard aluminum enclosure, the MD71THD incorporates dual NMEA 0183 input/output channels, allowing seamless switching between primary (Gyro) and secondary (Magnetic/TMC) heading sources. Integrated off-course monitoring, audible/visual alarms, and automatic magnetic deviation compensation ensure reliable backup heading data for ECDIS, RADAR, and steering repeaters.
Key Features:
• Dual Heading Source Control: Acts as the primary control head to monitor, select, and switch between Gyrocompass and Transmitting Magnetic Compass (TMC/EMC) data feeds.
• High-Contrast OLED Display: Bright red graphic OLED readout provides digital heading, system diagnostics, and intuitive calibration menu navigation.
• Automatic Deviation Compensation: Built-in software routine performs semi-automatic magnetic deviation correction and alignment offset setup.
• Comprehensive Signal Interfacing: Features dual opto-isolated NMEA 0183 inputs and outputs ($HEHDT, $HCHDG, $HCHDM, $THS) with auto-sensing baud rates.
• Fail-Safe Alarm Monitoring: Includes audible/visual off-course alarm, heading failure alert, and relay contacts for external power loss monitoring.
| Attribute | Specification Details |
| Manufacturer | Marine Data Systems Ltd. |
| Model / Part Number | MD71THD (P/N: MD71THD) |
| Item Type | Digital Display Head Unit for TMC & EMC Systems |
| Display Type | High-contrast red OLED display (digital numeric heading + system status & setup menu) |
| Heading Resolution | 0.1° digital resolution |
| Data Inputs | 2 x NMEA 0183 (IEC 61162-1) serial inputs ($HDT,$HDG, $HDM,$THS) + Fluxgate coil sensor input |
| Data Outputs | 2 x Opto-isolated NMEA 0183 (IEC 61162-1) serial outputs ($HEHDT,$HCHDG, $HCHDM,$THS) |
| Baud Rate | 4800 / 9600 / 19200 / 38400 baud auto-sensing |
| Illumination | Variable display backlighting (front pushbutton panel control / NMEA remote dimming) |
| Operating Power Supply | Dual 24V DC input (18V to 32V DC range) with automatic seamless failover switch |
| Power Consumption | Approx. 4W max |
| Alarms & Relay Contacts | Off-course alarm, heading fail alarm, power loss alarm relay (NO/NC contacts) |
| Mounting Format | Panel flush mount (144 x 144 mm DIN cut-out) / Optional bracket mount |
| Enclosure Material | Marine-grade aluminum alloy enclosure with 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 mounting); IP66 optional enclosed housing |
| Compliance & Standards | ISO 25862, ISO 8728, IEC 60945 (Marine EMC & Environmental), CE, Wheelmark (MED) |
| Application | Primary TMC/EMC system display, gyro/magnetic heading selector unit, wheelhouse central heading control panel |
| Country of Origin | United Kingdom |
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