RECOMMENDATION ITU-R M.541-8 … OPERATIONAL PROCEDURES FOR THE USE OF DIGITAL SELECTIVE-CALLING EQUIPMENT IN THE MARITIME ...
ANNEX 1 … Provisions and procedures for distress and safety calls
1 Introduction
    1.1 Method of calling
2 DSC distress call and message
3 Procedures for DSC distress calls
    3.1 Transmission by a mobile unit in distress
    3.2 Reception
    3.3 Acknowledgement of distress calls
    3.4 Distress relays
4 Procedures for DSC urgency and safety calls (see Note 1)
5 Testing the equipment used for distress and safety calls
ANNEX 2 … Provisions and procedures for calls other than distress and safety
1 Frequency/channels
    1.2 International calling
    1.3 National calling
    1.4 Method of calling
2 Operating procedures
    2.1 Coast station initiates call to ship
    2.2 Ship station initiates call to coast station (see Note 1)
    2.3 Ship station initiates call to ship station
ANNEX 3 … Operational procedures for ships for DSC communications on MF, HF and VHF
1 Distress
    1.1 Transmission of DSC distress alert
    1.2 Actions on receipt of a distress alert (see Note 1)
    1.3 Distress traffic
    1.4 Transmission of a DSC distress relay alert
    1.5 Acknowledgement of a DSC distress relay alert received from a coast station (see Note 1 of § 1.2 of this Annex)
    1.6 Acknowledgement of a DSC distress relay alert received from another ship
    1.7 Cancellation of an inadvertent distress alert (distress call)
2 Urgency
    2.1 Transmission of urgency messages
    2.2 Reception of an urgency message
3 Safety
    3.1 Transmission of safety messages
    3.2 Reception of a safety message
4 Public correspondence
    4.1 DSC channels for public correspondence
    4.2 Transmission of a DSC call for public correspondence to a coast station or another ship
    4.3 Repeating a call
    4.4 Acknowledgement of a received call and preparation for reception of the traffic
    4.5 Reception of acknowledgement and further actions
5 Testing the equipment used for distress and safety
6 Special conditions and procedures for DSC communication on HF
    6.1 Distress
    6.2 Urgency
    6.3 Safety
    6.4 Public correspondence on HF
    6.5 Testing the equipment used for distress and safety on HF
ANNEX 4 … Operational procedures for coast stations for DSC communications on MF, HF and VHF
1 Distress (see Note 1)
    1.1 Reception of a DSC distress alert (distress call)
    1.2 Acknowledgement of a DSC distress alert (distress call)
    1.3 Transmission of a DSC distress relay alert (distress relay call)
    1.4 Reception of a distress relay alert (distress relay call)
2 Urgency
    2.1 Transmission of a DSC announcement
3 Safety
    3.1 Transmission of a DSC announcement
4 Public correspondence
    4.1 DSC frequencies/channels for public correspondence
    4.2 Transmission of a DSC call to a ship
    4.3 Repeating a call
    4.4 Preparation for exchange of traffic
    4.5 Acknowledgement of a received DSC call
    4.6 Preparation for exchange of traffic
5 Testing the equipment used for distress and safety calls
6 Special conditions and procedures for DSC communication on HF
    6.1 Distress
    6.2 Urgency
    6.3 Safety
    6.4 Testing the equipment used for distress and safety
ANNEX 5 … Frequencies used for DSC
1 The frequencies ...
2 The frequencies assignable ...
    2.1 Ship stations (see Note 1)
    2.2 Coast stations (see Note 1)