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Voyage data recorder - Data recorded

Illustration indicating data recorded by our voyage data recorder (VDR)

Difference between VDR and S-VDR

There is no principle difference between a voyage data recorder (VDR) and a simplified voyage data recorder (S-VDR). The difference is the amount of information required to be recorded. The VDR requires more data to be recorded than the S-VDR.

Data types

  • Date and time: Referenced to UTC with an indication of the source. The source could be the GPS
  • Ship’s position: In latitude and longitude with the datum used. The source could be the GPS
  • Speed: Through water or speed over ground with indication of which it is. The source could be the speed log
  • Heading: As indicated by the ship’s compass. The source could be the gyro compass
  • Bridge audio: As picked up by one or more microphones positioned on the bridge so that conversation at or near the conning stations, radar displays, chart tables, etc., is adequately recorded. As far as practicable, the positioning of microphones should also capture intercom, public address systems and audible alarms on the bridge
  • VHF communications: Relating to ship operations should be recorded
  • Radar data: Electronic signal information from within one of the ship’s radar installations with recording of all the information which was actually being presented on the master display of that radar at the time of recording
  • AIS data: If it is impossible to obtain radar data by using a commercially available interface then AIS target data should be recorded as a source of information regarding other ships. If radar data is recorded, AIS information may be recorded additionally as a beneficial secondary source of information on both other and own ship. AIS data is not mandatory, but an option when it is impossible to obtain radar data by means of a commercially available interface
  • Additional data: Items listed by IMO with the requirements set out in resolution A.861(20) should be recorded when the data is available in accordance with the international digital interface standard NMEA0183 using approved sentence formatters. The additional data listed by IMO with the requirements in resolution A.861(20) are:
      – Echo sounder
      – Main alarms
      – Rudder order and response
      – Engine order and response
      – Hull openings status
      – Watertight and fire door status
      – Accelerations and hull stresses
      – Wind speed and direction

The additional data (any or all) shall only have to be recorded if the data are available on the bridge and the data signals are available in NMEA0183 format. Hence, the principle difference between VDR and S-VDR lays in the requirements for recording of additional data

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