The VDR (Voyage Data Recorder) is the maritime equivalent of the black box utilized by http://www.digitaldealdataroom.info/how-to-get-started-with-your-new-ideals-vdr-system/ airlines. The system is usually two-parts, consisting a data-collection unit and a deck-mounted safety pod designed to withstand shock, fire, deep-sea pressurized, and penetration. It is used primarily to record navigation events, but can also provide useful data for heavy weather damage analysis and monitoring of performance, as well as for crew training.
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Up-grading
Many ships equipped with VDR/SVDR equipment comply with the bare minimum regulatory requirements, but Members are encouraged to consider using the equipment for incident investigation, preventive maintenance and bridge team training as in addition to recording near misses. Additionally, there are applications that can extend the amount of duration for which VDR data is available from the current 12 hour minimum and a decision should be taken on whether or not to upgrade to this.
The system is built around an industrial grade computer that performs many functions, such as processing and encoding information received from sensors. It then stores the data in a capsule that is designed to withstand an accident and provide evidence of what occurred onboard the vessel. The key components of the VDR system include a data collection unit, which is situated on the bridge, a dedicated power source, an interface unit and batteries for backup. The unit collects all information from the integrated sources, including microphones to record bridge audio and transmits it to a Concentrator where a set of NMEA 0183 sentence is processed and encoded before being sent to the final recording media.