VHF Data Exchange System messages

Physical link Msg Title Description Prioritysort descending Access scheme Communication state Transmitted by
3 Scheduled Individual Addressed Message Individual addressed data with communication state. Requires acknowledgement not applicable RATDMA, FATDMA, MITDMA MITDMA Mobile station, Base station
0 Broadcast AIS ASM Message Encapsulated AIS ASM messages not applicable RATDMA N/A Base station
4 Individual Addressed Message Individual addressed data with no communication state. Requires acknowledgement not applicable RATDMA, FATDMA N/A Mobile station, Base station
1 Scheduled Broadcast Message Broadcast data using communication state not applicable RATDMA, FATDMA, MITDMA MITDMA Mobile station, Base station
5 Acknowledgment Message This message is used to provide and acknowledgment for one or more addressed messages not applicable RATDMA, FATDMA, MITDMA N/A Mobile station, Base station
2 Broadcast Message Broadcast data with no communication state not applicable RATDMA, FATDMA N/A Mobile station, Base station
6 Geographical Multicast Message Addressed to a group of stations defined by their geographical location with no communication state. No acknowledgment required. not applicable RATDMA, FATDMA N/A Mobile station, Base station