Specifications

-1.2-
non-halogen Firewire cable or IEEE1394.
Data Collecting Unit
The Data Collecting Unit (DCU) mainly consists of Data Processor Unit, Power
Distribution Unit and Junction Box. The DCU includes two 12 V backup batteries with a
lifetime of approximately four years. The DCU collects the data from various sensors and
radar and records them in the flash memory in the capsule (final recording medium).
Recording interval of data and audio is;
- Radar video signal: every 15 seconds
- Bridge and VHF audio: real time
- IEC sentences: when received
- Analog and digital data: every half seconds
Integrity
The recording integrity is ensured by continuous monitoring of power supply, record
function, bit error rate, an microphone functionality. Visual alarm is generated for
malfunction of any of these. Alarm status is also indicated by relay contacts.
Data items to be recorded
.1 Date and time
Date and time is obtained from an external GPS navigator referenced to UTC. Time
information is recorded at intervals of 1 s. Without data and time data, no data except
audio signal is recorded.
.2 Ship’s position
Latitude, longitude and datum are obtained from a GPS navigator, Loran-C receiver or
other EPFS available on standard digital interface. The source of data is identifiable on
playback.
.3 Speed
Speed through the water (STW) or speed over the ground (SOG) is recorded at intervals
of 1 s. The resolution is 0.1 kt. Transverse speed is also indicated when available on
board.
.4 Heading
Heading is recorded at intervals of 1 s to a resolution of 0.1°. The data is labelled G
(gyrocompass), GPS, GLONASS, MAG. If heading information is not available on IEC
61162 format, an appropriate interface may be necessary.
.5 Bridge audio
Six microphones are supplied as standard to record conversation at conning station,
radar display, chart table. If possible, the microphones should be positioned to capture
the audio from the intercom, public address system, and audible alarms on the bridge.