ITU R M 541:2004
ITU R M 541:2004 Operational Procedures For The Use Of Digital Selective-calling Equipment In The Maritime Mobile Service
Table of Contents
Annex1Provisionsandproceduresfordistress,urgencyandsafetycalls
1Introduction
1.1Methodofcalling
2DSCdistressalert
3ProceduresforDSCdistressalerts
3.1Transmissionbyamobileunitindistress
3.1.3Distressalertattempt
3.1.4Distress
3.2Reception
3.3Acknowledgementofdistressalerts
3.4Distressrelays
4ProceduresforDSCurgencyandsafetycalls
5Testingtheequipmentusedfordistressandsafetycalls
Annex2Provisionsandproceduresforroutinecalls
1Frequency/channels
1.2Internationalcalling
1.3Nationalcalling
1.4Methodofcalling
2Operatingprocedures
2.1Coaststationinitiatescalltoshipstation(seeNote1)
2.2Shipstationinitiatescalltocoaststation(seeNote1)
2.3Shipstationinitiatescalltoshipstation
Annex3OperationalproceduresforshipsforDSCcommunications
onMF,HFandVHF
1Distress
1.1TransmissionofDSCdistressalert
1.2Actionsonreceiptofadistressalert
1.3Distresstraffic
1.4TransmissionofaDSCdistressrelaycall
1.4.1TransmissionofaDSCdistressrelaycallonbehalf
ofsomeoneelse
1.5AcknowledgementofaDSCdistressrelaycallreceivedfrom
acoaststation
1.6AcknowledgementofaDSCdistressrelaycallreceivedfrom
anothership
1.7Cancellationofaninadvertentdistressalert
2Urgency
2.1Transmissionofurgencymessages
2.2Receptionofanurgencymessage
3Safety
3.1Transmissionofsafetymessages
3.2Receptionofasafetymessage
4Publiccorrespondence
4.1DSCchannelsforpubliccorrespondence
4.1.1VHF
4.1.2MF
4.2TransmissionofaDSCcallforpubliccorrespondencetoa
coaststationoranothership
4.3Repeatingacall
4.4Acknowledgementofareceivedcallandpreparationfor
receptionofthetraffic
4.5Receptionofacknowledgementandfurtheractions
5Testingtheequipmentusedfordistressandsafety
6SpecialconditionsandproceduresforDSCcommunicationonHF
6.1Distress
6.1.1TransmissionofDSCdistressalert
6.1.2Preparationforthesubsequentdistresstraffic
6.1.3Distresstraffic
6.1.4ActionsonreceptionofaDSCdistressalertonHF
fromanothership
6.1.5TransmissionofDSCdistressrelaycall
6.1.6AcknowledgementofaHFDSCdistressrelaycall
receivedfromacoaststation
6.2Urgency
6.2.1TransmissionofDSCannouncementofanurgency
messageonHF
6.2.2Transmissionoftheurgencymessageandsubsequent
action
6.3Safety
Annex4OperationalproceduresforcoaststationsforDSC
communicationsonMF,HFandVHF
1Distress(seeNote1)
1.1ReceptionofaDSCdistressalert
1.2AcknowledgementofaDSCdistressalert
1.3TransmissionofaDSCdistressrelaycall
1.4Receptionofadistressrelaycall
2Urgency
2.1TransmissionofaDSCannouncement
3Safety
3.1TransmissionofaDSCannouncement
4Publiccorrespondence
4.1DSCfrequencies/channelsforpubliccorrespondence
4.1.1VHF
4.1.2MF
4.2TransmissionofaDSCcalltoaship
4.3Repeatingacall
4.4Preparationforexchangeoftraffic
4.5AcknowledgementofareceivedDSCcall
5Testingtheequipmentusedfordistressandsafetycalls
6SpecialconditionsandproceduresforDSCcommunicationonHF
6.1Distress
6.1.1ReceptionandacknowledgementofaDSCdistress
alertonHF
6.1.2Distresstraffic
6.1.3TransmissionofDSCdistressrelaycallonHF
6.2Urgency
6.2.1Transmissionofurgencyannouncementandmessage
onHF
6.3Safety
6.3.1Transmissionofsafetyannouncementsandmessages
onHF
Annex5FrequenciesusedforDSC
2.1Shipstations(seeNote2)
2.2Coaststations(seeNote2)