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AIS-VHF data-link message, AIS-VHF data-link own-vessel message
Where there is no commercial off-the-shelf interface available to obtain radar data then AIS target
data shall be recorded as a source of information regarding other ships, otherwise AIS
information may be recorded additionally as a beneficial secondary source of information on both
other and own ship.
The VDM message (UAIS VHF Data-link) shall be recorded in such a way that all target data
available from the onboard AIS are acquired. If the VDO message (UAIS VHF Data-link
Own-vessel report) is recorded, this shall be additional to the recording of individual sensor data.
Depth (echo sounder)
Depth under keel up to a resolution of 0.1 m as available on the ship is recorded.
Alarms
The status of all IMO mandatory alarms is recorded individually with ID number and time stamp.
Audible alarms from the alarm units are stored simultaneously by the bridge audio microphones.
Rudder order/response
Rudder order and response angles are recorded up to a resolution of 1° as available on the ship.
The rudder information is recorded. If more than one rudder is provided, the circuitry can be
duplicated.
Engine order/response
The DCU obtains the engine order and response from the engine telegraph or direct engine
control. The signal level is normally 0-10 V. The engine parameters with shaft revolution and
ahead/astern indicators are recorded to a resolution of 1 rpm.
All order and response from bow, stern, thruster, tunnel thrusters and controllable pitch propellers
shall be recorded. The S-VDR shall record this data if said serial data is available.
Hull openings, watertight doors
Inputs digital or RS-422 serial can be connected individually. The data is received at intervals of 1
s and stored with time stamps. Serial data sentence XDR is received at a data rate of 1,200-9,600
baud.
Accelerations and hull stresses
The DCU obtains signals from appropriate hull stress and response monitoring devices. The
inputs are recorded individually and stored with time stamps. Serial data sentence XDR is
received at a data rate of 1,200-9,600 baud.
Wind speed and direction
The DCU obtains the signal from appropriate wind speed and direction sensor. The inputs are
recorded individually and stored with time stamps. Serial data sentence XDR is received at a data
rate of 1,200-9,600 baud.
VDR alarm output
There is no requirement for the S-VDR to send alarm messages. If, as an option, such messages
are sent then the appropriate sentence format is ALR.