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3. DSC OVERVIEW
3-3
3.4 Description of Call Screens
This section provides the information necessary for interpreting the receive and send
call screens.
3.4.1 RX calls
Below are sample distress alert and individual RX call screens. The contents of other
types of RX calls are similar to that of the individual call.
Distress alert
Individual RX call
Distress alert sent 2200 Hz, continuous (2 seconds)
Own ship position not updated 2000 Hz (250 ms) and 0 Hz (500 ms)
Distress alert call received 2200 Hz and 1300 Hz (250 ms)
Distress relay call received 2200 Hz and 1300 Hz (250 ms)
Distress relay ack call received 2200 Hz (500 ms) and 1300 Hz (500 ms)
Distress ack call received 2200 Hz (500 ms) and 1300 Hz (500 ms)
Urgency call received 2200 Hz and 0 Hz (250 ms)
Urgency ack call received 2200 Hz and 0 Hz (500 ms)
Alarm Frequency (interval)
Working frequency
to use
Call type
Elapsed time since
distress alert received
ID No. (MMSI)
of ship in
distress
Communication
mode and
suggested
channel
Available user options
Session in progress
RF gain
Speaker icon
DSC frequency
Position of ship
in distress
Nature of distress
Distance to ship
in distress
34
°
42.2800’N/135
°
19.5900’W/14:12
Working frequency
to use
Speaker icon
Elapsed time since
call received
ID No. (MMSI)
of ship
sending this
message
Communication
frequency
RF gain
Available user options
Communication mode
Session in progress
Call type
[SELECT AN ACK]
INDIVIDUAL MSG
ELAPSED TIME:
00
H
00
M
16
S
FROM :
COMM MODE
:
COMM FREQ
:
123456789
TELEPHONE
TX 2170.0/RX
2170.0 kHz
S
ACCEPT
B
TX 2177.0
/
RX 2177.00kHz