Binary acknowledgement of addressed message
| Name | NumberOfBits | ArrayLength | Type | Units | Description |
|---|---|---|---|---|---|
| MessageID | 6 | uint | AIS message number. Must be 7 | ||
| RepeatIndicator | 2 | uint | Indicated how many times a message has been repeated 0: default 3: do not repeat any more |
||
| UserID | 30 | uint | Unique ship identification number (MMSI). Also known as the Source ID | ||
| Spare | 1 | uint | Not used. Should be set to zero. | ||
| DestID1 | 30 | uint | MMSI destication to ACK | ||
| SeqID1 | 2 | uint | Sequence ID of the message to be acknowledged | ||
| DestID2 | 30 | uint | MMSI destication to ACK | ||
| SeqID2 | 2 | uint | Sequence ID of the message to be acknowledged | ||
| DestID3 | 30 | uint | MMSI destication to ACK | ||
| SeqID3 | 2 | uint | Sequence ID of the message to be acknowledged | ||
| DestID4 | 30 | uint | MMSI destication to ACK | ||
| SeqID4 | 2 | uint | Sequence ID of the message to be acknowledged |