The Marine Data MD71HR is a compact, high-precision digital numeric NMEA heading repeater display manufactured in the United Kingdom by Marine Data Systems. Designed for flush console, overhead, or panel mounting inside vessel wheelhouses, chart tables, and steering stations, the MD77HR presents clear, real-time heading data in a crisp red LED/OLED digital numeric format.

The unit displays heading information down to 0.1° resolution alongside a graphic trend indicator showing rate-of-turn or heading direction tendencies. Built into a compact DIN-standard aluminum enclosure, the MD71HR automatically senses and decodes serial NMEA 0183 heading sentences ($HDT, $HDG, $HDM, $THS) from shipboard gyrocompasses, satellite compasses, and magnetic sensors. Variable red LED display dimming ensures glare-free night-watch operations without impairing nocturnal vision.

Key Features:
• Clear Digital Numeric Display: Bright red numeric display provides instantaneous heading readout with 0.1° digital resolution.
• Dynamic Trend Indicator: Integrated graphic arc indicator displays heading direction trend and rate-of-turn information.
• Universal NMEA 0183 Interfacing: Decodes standard NMEA 0183 serial heading data ($HDT, $HDG, $HDM, $THS) with automatic baud rate sensing.
• Variable Night Dimming: Fully dimmable red display backlighting controlled locally via front pushbuttons or remotely via NMEA commands.
• Compact DIN Panel Footprint: Standard 96×96 mm DIN panel dimensions allow easy integration into crowded bridge consoles and overhead steering panels.