Specifications

-1.3-
The microphones are labelled Mic1, Mic2, etc. Microphone captures conversation in the
bridge, audio signals from equipment and sound from machinery. The microphone
generates a test beep every 12 hours which is also recorded. The microphone picks up
audio signals ranging from 150 to 6000 Hz.
.6 Communications audio
A maximum of two VHF communications are recorded for both transmitted and received
audio signals. Audio will be compressed by MP3 or similar technique. The VHF radio
connections are labeled VHF1 and VHF2.
.7 Radar data
Radar image including range rings, EBLs, VRMs, plotting symbols, radar maps, parts of
SENC, voyage plan, and other essential navigational indications, is recorded in the DRU
via the interface in the DCU which is connected to the buffered video output of the radar
display unit. One complete picture frame is captured at intervals of 15 s.
The radar display complying with IEC 60936-1 should have a buffered output (VESA
DMTS compatible) with resolutions between 640 x 480 and 1280 x 1024, and can be
directly connected with the VDR. Scanning may be interlaced or non-interlaced.
Most type approved radars from different manufacturers can be interfaced with the DCU.
.8 Echo sounder
Depth under keel up to a resolution of 0.1 m as available on the ship is recorded.
.9 Main alarms
The status of all IMO mandatory alarms are recorded individually with ID number and
time stamp.
Audible alarms from the alarm units is stored simultaneously by the bridge audio
microphones.
.10 Rudder order and 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.
.11 Engine order and 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.
If a bow or stern thruster is fitted, the circuitry must be duplicated. If controllable pitch
propellers are fitted, their order and response can be recorded.
.12 Hull openings (doors) status
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.