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VDR is the equivalent of a blackbox in an aeroplane. It keeps track of all the details of a maritime accident, including the time, date as well as the location, speed and the course of the vessel. The information recorded can be used to identify potential safety hazards and improve operations.
In accordance with IMO regulations, the standard VDR must be able to store a variety of information. This includes the date and time that is referred to Coordinated Universal Time (UTC) vessels’ position (latitude longitude, longitude, coordinate reference) as well as speed and heading bridge audio (acquisition of voice messages recorded by one or more microphones located on the bridge in order to record conversations, as well as audible alarms), Very High Frequency radio communications (VHF) and radar data (a exact replica of the display which was on view at the time of recording), rudder order and response engine order and response watertight doors as well as their status, and accelerations and hull stress.
The system comprises an encoder that processes and encodes the data stream sensors that provide input to the concentrator, and the final recording medium (FRM) designed to survive accidents and allow for the retrieval of data from voyages. The FRM can be fixed on the vessel or a floating unit that is connected to EPIRB for early location in the event of an accident.
The best way to ensure that a vdr operates correctly is to incorporate its use in every bridge crew’s drills and training exercises. The saved data can be used to identify areas that require training as well as to improve bridge procedures and operational safety.
