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VDR data recorded
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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