Automatic identification system messages

Msg Titlesort descending Description Priority Access scheme Communication state Transmitted by
6 Addressed binary message Binary data for addressed communication 4 RATDMA, ITDMA, FATDMA N/A Mobile station, Base station
12 Addressed safety related message Safety related data for addressed communication 2 FATDMA, RATDMA, ITDMA N/A Mobile station, Base station
21 Aids-to-navigation report Position and status report for aids-to-navigation 1 FATDMA, RATDMA N/A Mobile station, Base station
16 Assigned mode command Assignment of a specific report behaviour by competent authority using a Base station 1 FATDMA, RATDMA N/A Base station
4 Base station report Position, UTC, date and current slot number of base station 1 FATDMA, RATDMA SOTDMA Base station
7 Binary acknowledge Acknowledgement of received addressed binary data 1 RATDMA, ITDMA, FATDMA N/A Mobile station, Base station
8 Binary broadcast message Binary data for broadcast communication 4 FATDMA, RATDMA N/A Mobile station, Base station
22 Channel management Management of channels and transceiver modes by a Base Station 1 FATDMA, RATDMA N/A Base station
10 Coordinated universal time and date inquiry Request UTC and date 3 RATDMA, ITDMA, FATDMA N/A Mobile station, Base station
11 Coordinated universal time and date response Current UTC and date if available 3 RATDMA, ITDMA SOTDMA Mobile station
20 Data link management message Reserve slots for base stations 1 FATDMA, RATDMA N/A Base station
19 Extended class B equipment position report No longer required; Extended position report for Class B shipborne mobile equipment; contains additional static information 1 ITDMA N/A Mobile station
17 Global navigation-satellite system broadcast binary message DGNSS corrections provided by a base station 2 FATDMA, RATDMA N/A Base station
23 Group assignment command Assignment of a specific report behaviour by competent authority using a Base station to a specific group of mobiles 1 FATDMA, RATDMA N/A Base station
15 Interrogation Request for a specific message type (can result in multiple responsed from one or several stations) 3 RATDMA, ITDMA, FATDMA N/A Mobile station, Base station
27 Long-range automatic identification system broadcast message Class A and Class B "SO" shipborne mobile equipment outside base station coverage 1 MSSA N/A Mobile station
26 Multiple slot binary message with communications state Scheduled binary data transmission (Broadcast or addressed) 4 SOTDMA, RATDMA, ITDMA, FATDMA SOTDMA, ITDMA Mobile station, Base station
1 Position report Scheduled position report; (Class A shipborne mobile equipment) 1 SOTDMA, RATDMA, ITDMA SOTDMA Mobile station
2 Position report Assigned scheduled position report; (Class A shipborne mobile equipment) 1 SOTDMA SOTDMA Mobile station
3 Position report Special position report, response to interrogation; (Class A shipborne mobile equipment) 1 RATDMA ITDMA Mobile station
13 Safety related acknowledge Acknowledgement of received addressed safety related message 1 RATDMA, ITDMA, FATDMA N/A Mobile station, Base station
14 Safety related broadcast message Safety related data for broadcast communication 2 RATDMA, ITDMA, FATDMA N/A Mobile station, Base station
5 Ship static and voyage related data Scheduled static and voyage related vessel data report; (Class A shipborne mobile equipment) 4 RATDMA, ITDMA N/A Mobile station
25 Single slot binary message Short unscheduled binary data transmission (Broadcast or addressed) 4 RATDMA, ITDMA, FATDMA, CSTDMA N/A Mobile station, Base station
18 Standard class B equipment position report Standard position report for Class B shipborne mobile equipment to be used instead of Message 1, 2 or 3 1 SOTDMA, ITDMA, CSTDMA SOTDMA, ITDMA Mobile station
9 Standard search and rescue aircraft position report Position report for airborne stations involved in SAR operations, only 1 SOTDMA, RATDMA, ITDMA SOTDMA, ITDMA Mobile station
24 Static data report Additionan data assigned to a MMSI Part A: Name Part B: Static Data 4 RATDMA, ITDMA, FATDMA, CSTDMA N/A Mobile station, Base station