| AIS message | ||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| ! | AIVDM | 1 | 2 |
| B |
| 0 | 50 |
| Symbol | Session ID | Number of statements | The statement sequence number | Message identification number | Channel | Encapsulate message | Fill bits | Check code |