| Message ID | Designation | Illustrate |
| 1 | Position report | Periodic position report |
| 2 | Position report | Position report for allocation schedule |
| 3 | Position report | Reply to inquiry |
| 4 | Base station report | Base location, UTC, date |
| 5 | Static data | Periodic static time report |
| 9 | Search and rescue aircraft location report | Position report for use by air stations operating on SAR only |
| 10 | UTC/date query | Query the UTC and date |
| 11 | UTC/date of response | UTC time |
| 12 | Edit security information | Address communication security information |
| 13 | Confirmation of safety information | Verify the addressing security information received |
| 18 | Class B terminal position report | Class B position report is in the same format as class 1, 2, and 3 packets |
| 19 | Class B terminal static data | Static and voyage data reporting for class B terminal |