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VDR continuously records real-time data relating to the status and output of the ship's equipment, command and control of the ship for 12hours according to IMO Performance Standard A.861(20) and IEC 61996.
- Data and time - GPS
- Ship's position and datum used - GPS
- Speed - speed log
- Heading - ship's compass
- Bridge and communications audio
- Radar data - ship's radar
- Depth - echo sounder
- Main alarms - the status of all IMO mandatory alarms on the bridge
- Rudder order and response - autopilot and rudder system
- Engine order and response - engine telegraphs or direct engine/propeller controls
- Hull openings(doors) status - ship's safety management system
- Watertight and fire door status - watering door system and fire alarm system .
- Accelerations and hull stress - hull stress monitoring system if a ship is fitted
- Wind speed and direction - anemometer
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