The Marine Data MD74HR/W is a weatherproof, IP66-rated digital NMEA compass heading repeater display manufactured in the United Kingdom by Marine Data Systems. Derived from the standard MD74HR panel repeater, the “/W” variant is housed within a fully enclosed, weather-sealed aluminum alloy enclosure designed for exposed bridge wings, open steering positions, flybridges, and exterior bulkheads.

The display features a dual-display OLED interface combining a crisp 4-digit numeric heading readout with a high-resolution moving tape-repeater graphic scale, delivering 0.1° heading resolution. Built to endure harsh outdoor marine environments, the MD74HR/W decodes standard NMEA 0183 serial heading sentences ($HDT, $HDG, $HDM, $THS) from shipboard gyrocompasses, satellite compasses, and magnetic heading sensors. Variable red OLED display dimming ensures glare-free operations during night watches without impairing dark-adapted vision.

Key Features:
• IP66 Weatherproof Enclosure: Sealed marine-grade housing engineered for exposed deck stations, flybridge helms, and bridge wing bulkheads.
• Dual OLED Graphic & Numeric Display: Combines a clear 4-digit numeric readout with a high-contrast moving tape compass card graphic.
• High-Accuracy 0.1° Heading Readout: Delivers real-time digital heading information with 0.1° resolution and immediate response.
• Universal NMEA 0183 Interfacing: Decodes serial NMEA 0183 heading data ($HDT, $HDG, $HDM, $THS) with automatic baud rate selection.
• Variable Red OLED Night Illumination: Dimmable red OLED lighting controlled locally via front pushbuttons or remotely via NMEA serial commands.