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					DSC PROCEDURES FOR
    VHF AND MF
Transmission of DSC distress alert
  A distress alert should be transmitted if, in the opinion
   of the Master, the ship requires immediate assistance.
  A DSC distress alert should include the ship’s last
   known position and time in UTC.
 The DSC alert is transmitted as follows:
 Tune the transmitter to the DSC distress channel (MF-
  2187.5 kHz, VHF channel 70)
 If time permits, select the nature of distress
 The ship’s last known position
 Time in UTC
 Type of subsequent distress communication
 Transmit the DSC distress alert
 Prepare for the subsequent distress traffic by tuning the
  radiotelephony transmitter to the distress traffic channel in
  the same band. (2182 kHz on MF,
channel 16 on VHF while waiting for
the distress acknowledgement.
 Actions on receipt of a distress alert
 Wait for the coast station to acknowledge first.
 If the alert is still continuing, acknowledge the distress
  alert and inform Coast Station or RCC
 Tune the radiotelephony receiver to the distress traffic in
  the same band.
 Transmission of a DSC distress relay
 Tune the transmitter to the DSC distress channel (MF-
  2187.5 kHz, VHF channel 70)
 Select the distress relay call format
 Key in - All ships call (VHF); Geographic Area Call
  (MF/HF); or Coast Stations MMSI.
 Station in distress MMSI, if known.
 The nature of distress, position and time if known.
 Type of distress communication
 Transmit the DSC distress relay call
 Prepare for the distress traffic while waiting for the
  acknowledgement.
 Cancellation of an inadvertent distress alert
A station transmitting an inadvertent distress alert shall
  cancel the distress alert:
 Immediately cancel the distress alert aurally over the
  associated telephony distress channel
 Monitor the associated telephony distress traffic channel
  and respond to any communications concerning that
  distress alert as appropriate.
 All stations All stations All stations
 This is
 BRUNITA, BRUNITA, BRUNITA CALLSIGN LKFE,
    MMSI 257666000
   In position 14°34’ N 120° 23E
   Please cancel my distress alert of 23 Feb, 0400H UTC
   Date and Time 23 of Feb., 0500H UTC
   Master MV BRUNITA Callsign LKFE
 Transmission of urgency messages
The broadcast of an urgency message is carried out on a DSC
  urgency call:
 Tune the transmitter to the DSC distress channel (MF-
  2187.5 kHz, VHF channel 70)
 Key in - All ships call (VHF) or Geographic Area Call
  (MF/HF) or individual call
 The category of call (urgency)
 Working frequency or channel
 Type of communication
 Transmit the
  DSC urgency call
 Transmission of safety messages
The broadcast of a safety message is carried out on a DSC
  safety call:
 Tune the transmitter to the DSC distress channel (MF-
  2187.5 kHz, VHF channel 70)
 Key in - All ships call (VHF) or Geographic Area Call
  (MF/HF) or individual call
 The category of call (safety)
 Working frequency or channel
 Type of communication
 Transmit the
  DSC safety call
 Public Correspondence
The Public correspondence is carried out on a DSC routine
  call:
 Tune the transmitter to the DSC distress channel (MF-
  2187.5 kHz, VHF channel 70 or the coast station’s working
  frequency)
 Key in the MMSI of a particular station to be called
 The category of call (routine)
 Working frequency or channel
 Type of communication
 Transmit the                     DISTRESS
                                   URGENCY
   DSC routine call
                                  SAFETY
                                  IMPORTANT SHIP TRAFFIC
                                  ROUTINE
 Repeating a DSC Call
 DSC Call for public correspondence may be repeated on
  the same or another DSC channel/frequency, if no
  acknowledgement is received within 5 min.
 Further call attempts should be delayed at least 15 min, if
  acknowledgement is still not received.


 DSC Test call
DSC PROCEDURES FOR
        HF
 Transmission of DSC distress alert
 DSC distress alert should be sent to coast stations A3 and
  A4 sea areas on HF.
 Propagation characteristics of HF radio waves should be
  taken into account in choosing HF bands for transmission
  of DSC distress alert.
 8414.5 kHz may in many cases be an appropriate first
  choice.
 Transmission of the DSC distress alert in more than one
  HF band will normally increase the probability of
  successful transmission..
 The HF DSC distress alert
 Tune the transmitter to the HF DSC distress frequency
  (4207.5, 6312, 8414.5, 12577, 0r 16804.5 kHz)
 If time permits, select the nature of distress
 The ship’s last known position
 Time in UTC
 Type of subsequent distress communication
 Transmit the DSC distress alert
 Prepare for the subsequent distress traffic by tuning the
  radiotelephony transmitter to the appropriate distress
  traffic frequency in the same band while waiting for the
  distress acknowledgement.
   HF Distress and Safety calling
            Frequencies
DSC (kHz)     Telephony (kHz)   Radiotelex (kHz)
     4297.5           4125           4177.5
    6312.0            6215           6268.0
     8414.5           8291           8376.5
    12577.0          12290          12520.0
   16804.5           16420          16695.0

				
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posted:3/22/2012
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