IMO PERFORMANCE STANDARDS
FOR S - VDR
IMO PERFORMANCE STANDARDS FOR SHIPBORNE SIMPLIFIEDVOYAGE DATA RECORDERS (S-VDRs)The purpose of a simplified voyage data recorder
(S-VDR) is tomaintain a store, in a secure and retrievable form, of
informationconcerning the position, movement, physical status, command
andcontrol of a vessel over the period leading up to and following
anincident having an impact thereon. Information contained in an S-VDR
should be made available to both the Administration and theship-owner.
This information is for use during any subsequentinvestigation to identify
the cause(s) of the incident.An S-VDR with capabilities not inferior to
those defined in theseperformance standards is required to be
fitted to ships of classesdefined in SOLAS chapter V, as amended.DEFINITIONSSimplified Voyage data recorder
(S-VDR) means a complete system,including any items required to interface
with the sources of inputdata, for processing and encoding the data,
the final recordingmedium, the power supply and dedicated reserve power
source.Sensor means any unit external to the S-VDR, to which the S-VDR
isconnected and from which it obtains data to be recorded.Final recording
medium means the item of hardware on which thedata is recorded such that
access to it would enable the data to berecovered and played back by
use of suitable equipment.Playback equipment means the equipment,
compatible with therecording medium and the format used during recording,
employedfor recovering the data. It includes also the display or presentationhardware
and software that is appropriate to the original datasource
equipment.Dedicated reserve power source means a secondary battery,
withsuitable automatic charging arrangements, dedicated solely
to theS-VDR, of sufficient capacity to operate it.
OPERATIONAL REQUIREMENTS1. The S-VDR should continuously maintain
sequential records of preselected data items relating to the status and
output of theship’s equipment, and command and control of the ship.2.
To permit subsequent analysis of factors surrounding an incident,the
method of recording should ensure that the various data itemscan be co-related
in date and time during playback on suitableequipment.3. The
final recording medium should be installed in a protectivecapsule of either
a fixed or float-free type, which should meet all of the
following requirements:• Be capable of being accessed following an
incident but secureagainst tampering;• Playback equipment is not normally
installed on a ship and is notregarded as part of a S-VDR for the purposes
of these performancestandards.• Maintain the recorded data for a period
of at least 2 yearsfollowing termination of recording;• Be of a
highly visible color and marked with retro-reflectivematerials; and• Be
fitted with an appropriate device to aid location.• The fixed
type protective capsule should comply with therequirements set out in
resolution A.861 (20) with the exception of the resulting
requirements for withstanding penetration.4. The float-free type
protective capsule should:• be fitted with means to facilitate grappling and
recovery;• be so constructed as to minimize risk of damage during
recoveryoperations; and• the device should be capable of transmitting
an initial locatingsignal and further locating homing signal for at least 48
hours over aperiod of not less than 7 days/168 hours.Data selection and
securityThe equipment should be so designed that, as far as is practical,
it isnot possible to tamper with the selection of data being input to
theequipment, the data itself nor that which has already beenrecorded. Any
attempt to interfere with the integrity of the data orthe recording should be
recorded.The recording method should be such that each item of therecorded data
is checked for integrity and an alarm given if a non-correctable error is
detected.Continuity of operationTo ensure that the S-VDR continues to record
events during anincident, it should be capable of operating from the
ship’semergency source of electrical power.
If the ship’s emergency source of electrical
power supply fails, theS-VDR should continue to record Bridge Audio from a
dedicatedreserve source of power for a period of 2 h. At the end of this 2
hperiod all recording should cease automatically.The time for which all
stored data items are retained should be atleast 12 h. Data items which are
older than this may be overwrittenwith new data.OPERATIONThe unit should
be entirely automatic in normal operation. Meansshould be provided whereby
recorded data may be saved by anappropriate method following an incident, with
minimal interruptionto the recording process.INTERFACINGInterfacing
to the various sensors required should be in accordancewith
the relevant international interface standards, where possible.Any
connection to any item of the ship’s equipment should be suchthat the operation
of that equipment suffers no deterioration, evenif the S-VDR system
develops faultData items to be recordedDate and timeDate and time, referenced
to UTC, should be obtained from a sourceexternal to the ship or from an
internal clock. The recording shouldindicate which source is in use. The
recording method should besuch that the timing of all other recorded data items
can be derivedon playback with a resolution sufficient
to reconstruct the history of the incident in detail.Ship’s positionLatitude
and longitude, and the datum used, should be derived froman electronic
position-fixing system (EPFS). The recording shouldensure that the
identity and status of the EPFS can always bedetermined on
playback.SpeedSpeed through the water or speed over the ground, including
anindication of which it is, derived from the ship’s speed and
distancemeasuring equipment.HeadingAs indicated by the ship’s
compass.Bridge AudioOne or more microphones positioned on the bridge
should be placedso that conversation at or near the conning stations,
radar displays,chart tables, etc., are adequately recorded. As far as
practicable,the positioning of microphones should also capture intercom,
publicaddress systems and audible alarms on the bridge.Communications AudioVHF communications
relating to ship operations should be recorded.Radar data, post-display
selection
This should include electronic signal
information from within one of the ship’s radar installations which
records all the information whichwas actually being presented on the
master display of that radar atthe time of recording. This should include any
range rings ormarkers, bearing markers, electronic plotting symbols, radar
maps,whatever parts of the SENC or other electronic chart or map thatwere
selected, the voyage plan, navigational data, navigationalalarms and the
radar status data that were visible on the display.The recording method should
be such that, on playback, it ispossible to present a faithful replica of the
entire radar display thatwas on view at the time of recording, albeit
within the limitations of any bandwidth compression techniques that are
essential to theworking of the S-VDR.AIS DataIf it is impossible to obtain
radar data3 then AIS target data shouldbe recorded as a source of information
regarding other ships. If radar data is recorded, AIS information may
be recorded additionallyas a beneficial secondary source of information on both
other andown ship.
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