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The Marine Data MD77ROT120 is a specialized analog dial Rate of Turn (ROT) indicator manufactured in the United Kingdom by Marine Data Systems. Specifically engineered for high-maneuverability vessels, workboats, river craft, and naval ships requiring a wider angular velocity monitoring window during tight maneuvering, the MD77ROT120 provides direct visual indication of vessel turning speeds up to ±120 degrees per minute.
The instrument features a high-visibility center-zero analog pointer dial calibrated precisely from 120°/min Port to 120°/min Starboard. Housed in a robust marine-grade aluminum alloy enclosure, the unit automatically decodes digital NMEA 0183 sentences ($ROT or $ROTA) from shipboard gyrocompasses, rate gyros, or AIS systems. Variable red LED backlighting ensures clear visibility and night-vision compliance on the wheelhouse console or main steering stand.
Key Features:
• ±120°/min Extended Scale Dial: High-visibility center-zero analog pointer scale calibrated for rapid-turning vessels up to 120 degrees per minute.
• Universal NMEA 0183 Compatibility: Automatically senses and decodes standard serial NMEA 0183 rate of turn sentences ($ROT, $ROTA).
• Variable Red Night Illumination: Dimmable red LED dial backlighting controlled via local rotary knob or remote NMEA serial commands.
• Marine Class Rugged Build: Corrosion-resistant aluminum alloy chassis built to satisfy IEC 60945 environmental and EMC standards for bridge instrumentation.
• Flexible Panel Integration: Standard DIN console mounting format for seamless integration into wheelhouse instrument banks and steering panels.
| Attribute | Specification Details |
| Manufacturer | Marine Data Systems Ltd. |
| Model / Part Number | MD77ROT120 (P/N: MD77ROT120) |
| Item Type | Dial Rate of Turn (ROT) Indicator (±120°/min Range) |
| Display Type | Center-zero moving pointer dial (Port / Starboard angular velocity) |
| Scale Range | 120°/min Port to 120°/min Starboard (±120°/min full scale) |
| Data Inputs | NMEA 0183 (IEC 61162-1) serial input ($ROT,$ROTA) |
| Baud Rate | 4800 / 9600 / 19200 / 38400 baud auto-sensing |
| Illumination | Variable red LED backlighting (front panel control / NMEA remote dimming) |
| Operating Power Supply | 24V DC nominal (18V to 32V DC range) |
| Power Consumption | Approx. 4W max |
| Mounting Format | Panel flush mount (192 x 192 mm DIN console cut-out) / Optional trunnion bracket |
| Enclosure Material | Marine-grade aluminum alloy enclosure with black powder coat finish |
| Dimensions | Approx. 192 mm (W) x 192 mm (H) x 105 mm (D) |
| Weight | Approx. 2.2 kg (4.85 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 | IEC 60945 (Marine EMC & Environmental), ISO 20673, CE, Wheelmark (MED) |
| Application | High-maneuverability vessel turning rate indicator, tugboat/river craft console display, and steering position repeater |
| Country of Origin | United Kingdom |
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