Furuno VR-7000 Operator's Manual page 13

1. OPERATION
Data items to be recorded
Note: If the sensor data is input to the DCU through an external unit (sensor adapter,
junction box, etc.), the input of the sensor data is delayed because of the communica-
tion lag between the DCU and external unit.
Date and time: Date and time are obtained from an external GPS navigator refer-
enced to UTC. When an external GPS navigator is not available, a signal is recorded
with a built-in clock in the DCU.
Ship's position and datum used: Latitude, longitude and datum are obtained from a
GPS navigator, Loran-C receiver or other EPFS or INS available on standard serial
interface. The source of data is identifiable on playback.
Speed (water and/or ground): Speed through the water (STW) or speed over the
ground (SOG) is recorded. The resolution is 0.1 kn. Transverse speed is also indicat-
ed when available on board.
Heading (true, magnetic): Heading is recorded to a resolution of 0.1°. The data is la-
beled G (gyrocompass), GPS, GLONASS, MAG. If heading information is not avail-
able in IEC 61162 format, an appropriate interface may be necessary.
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 num-
ber 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 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.
Hull openings, watertight doors: Digital and serial signals can be input individually.
The data is stored with time stamps.
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.
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. The wind speed resolution is 1 unit (1 kn, 1 m/s, etc.). The wind direction res-
olution is 1°.
VDR alarm output: If, as an option, such messages are sent then the appropriate
sentence formats are ALF and ALC.
Radar/ECDIS data: Radar/ECDIS image is recorded in the Fixed DRU, Float-free
DRU and long term device via the LAN or the video LAN converter. Range rings,
EBLs, VRMs, plotting symbols, radar maps, parts of SENC, voyage plan, and other
essential navigational indications are included in the recorded radar image. Own
1-3