Recommendation ITU-R M.493-16
Policy on Intellectual Property Right (IPR)
Annex 1 General purpose equipment characteristics
1 General
2 Technical format of a call sequence
3 Dot pattern and phasing
4 Format specifier
5 Address
Example:
6 Category of call
7 Self-identification
8 Messages
8.1.1 Message 1
8.1.2 Message 2
8.1.3 Message 3
8.1.4 Message 4
8.2 Distress alert relay, distress alert relay acknowledgement,
distress acknowledgement
8.2.1 Message 0
8.2.2 Message 1
8.2.3 Message 2
8.2.4 Message 3
8.2.5 Message 4
8.3 Other types of calls
8.3.1 Message 1
8.3.2 Message 2
8.3.3 Message 3
8.4 Distress alert relay
8.5 Test calls
8.6 Distress self-cancel operation
9 End of sequence
10 Error-check character
11 Distress alert attempt
12 Shipborne human machine interface
12.1 Shipborne audible digital selective calling alarm and audible
indication
12.2 Inactivity timer
12.3 Display
12.4 Maritime mobile service identity
12.5 Automatic channel switching function on VHF
12.6 Data interface
12.7 Position updating
12.8 Geographic area entry
12.9 Medical transport and neutral ships and aircraft
12.10 Group calls (Ships having common interest)/individual call
12.11 Automatic connection system function on MF/HF (Class A and
Class E)
12.12 Implementation of the distress self-cancel procedure
13 Handheld human machine interface
13.1 Audible digital selective calling alarms and audible
indications
13.2 Inactivity timer
13.3 Display
13.4 Maritime mobile service identity/maritime identity
13.5 Automatic channel switching
14 Handheld VHF digital selective calling equipment with electronic
position fixing systems (Class H)
15 Position request operation for Class D, Class E and Class H
16 Man overboard devices using VHF digital selective calling (Class M)
16.1 Open and closed loop operation
16.2 Distress self-cancel operation
16.3 Action on receipt of acknowledgment messages
16.4 Open loop man overboard devices
16.5 Closed loop man overboard devices
Annex 2 Equipment classes
1 Equipment classes only apply to shipborne equipment
Annex 3 User interface for simplified operation of shipborne equipment
1 General
2 Definitions
3 Controls
4 Display of messages in plain language
5 Transmission of digital selective calling messages
5.1 Digital selective calling call composition features
5.2 Operational guidance to the operator
5.3 Defaults
5.4 Other items
Annex 4 Automated procedures for simplified operation in shipborne equipment
1 General
2 Definitions
3 Tasks of automated procedures
3.1 Tasks common to all automated procedures handling digital
selective calling calls
3.1.1 Handling alarms or audible indications
3.1.2 Displaying stages of the automated procedure
3.1.3 Tuning the radio
3.1.4 Displaying operator options
3.1.5 Handling digital selective calling calls not
pertinent to the active procedure
3.1.6 Displaying warnings
3.1.7 Handling digital selective calling calls containing
errors
3.1.8 Transmission of digital selective calling messages
3.1.9 Automated termination
3.2 Tasks specific to certain automated procedures
3.2.1 Tasks of automated procedures initiated by
receiving non‑distress digital selective calling messages
3.2.2 Tasks of automated procedures initiated by sending
a non‑distress digital selective calling call
3.2.3 Tasks of automated procedures initiated by
receiving a distress digital selective calling call or sending a distress alert
relay on behalf of someone else
3.2.4 Tasks of automated procedures initiated by sending
a distress alert attempt
3.2.5 Radiotelephone communications automated procedure
3.2.6 Other non-digital selective calling automated
procedures
3.3 Tasks concerning multiple automated procedures
3.3.1 Number of simultaneous automated procedures
3.3.2 Sending distress automated procedure
3.3.3 Operator options
3.3.4 Unacknowledged poll, test, or position request
automated procedures received on hold
3.4 Warnings