MD76 HEADING MON (OFF COURSE ALARM)

NMEA Digital Input • An alarm sounds if the vessel heading deviates by more than a pre-set amount. • An important aid for maritime safety. • Accepts NMEA 0183 heading data from any independent heading source. • Fulfils the IMO requirements for using autopilot. • Rugged, marinised aluminium alloy housing. • Independently tested to IEC60945: 2002 by TÜV Product Service Ltd. Overview: The MD76/8 Heading Monitor by Marine Data is an off-course safety alarm designed for seagoing vessels. An audible and visible alarm is activated at the steering position whenever a vessel deviates from a chosen course by more than a pre-set amount (in degrees). A heading monitor is a very important aid to safety at sea and is now a requirement by the IMO whenever an autopilot is installed. Special Features: • The MD76/8 can accept a NMEA digital heading sentence from any independent heading source and may use the heading source to monitor any heading deviations. • On/Off activation can be linked with activation of an autopilot. • Remote trigger circuit for an external alarm sounder. • MD76/8 generates an audible and visible alarm when main power failure is detected. The unit will then automatically switch to the appropriate backup supply. Application: • The MD76/8 generates an audible and visible alarm when the vessel deviates from a chosen course by more than a pre-set amount (in degrees). • The MD76/8 is flexible in application and can be incorporated into a variety of different system configurations. It is especially suited to detecting vessel course deviations as part of a Transmitting Magnetic Compass (TMC) system or an Electromagnetic Compass System (EMC). Specification: Physical: • Weight: 1.85kg. • Dimensions: Overall width 235mm; overall length 180mm; overall height 145mm (with unit level on mounting bracket). • Mounting: Panel mounted or bracket mounted. • Connections: 2x 12-way internal screw terminal connectors. • Construction: Aluminium enclosure. • Standard Colour: Jet Black RAL9005; fine textured finish. Electrical: • Power supply: 24V DC main supply and 24V DC separate backup supply. • Data input: Digital RS422 NMEA 0183; 4800 Baud; 1 start bit; 8 bits; no parity; 1 stop bit. • Data sentences detected: HDT, HDG and HDM; detected on start-up in ascending order of priority. • Data outputs: Audible and visible alarm. • DC remote alarm trigger (rated at 24VA): mutually exclusive normally open (NO) and normally closed (NC) loop circuits. • Autopilot remote On/Off control link (terminals B1 & B2): Must be kept normally closed (NC) for the MD76/8 to operate. • Cable requirements: Data cable 7/0.2 (7 strand, 0.2mm²); Power supply cable 24VA rated; Autopilot remote On/Off control link (NC) & external sounder trigger cable 24VA rated. Operational: • Performance: ±1° accuracy. • Follow up rate: Limited by compass follow up rate. • Display: Visible alarm. • The course width selector chooses an allowable course deviation of 4°, 6°, 8°, 12°, 16° or 20° • Alarm loudness 90dB at 30cm (ref 20µPa). Environmental: • Water resistance rating: IP54. • Operating temperature: -10°C to 70°C.