Details:
| Parameter | Bit | Description |
|---|---|---|
| Message ID | 6 | Identifier for Message 6; always 6 |
| Repeat Indicator | 2 | Used by the repeater to indicate how many times a message has been repeated. Default = 0 ; 3 = do not repeat any more |
| Source ID | 30 | MMSI number of source station |
| Sequence Number | 2 | 0 – 3 |
| Destination ID | 30 | MMSI number of destination station |
| Retransmit Flag | 1 | Retransmit Flag should be set upon retransmission: 0 = no retransmission = default; 1 = retransmitted. |
| Spare | 1 | Not used, should be set to zero. Reserved for future use. |
| Application Identifier | 16 | As described in Table 2,6 |
| UN country code | 12 | 2*6 Bit characters |
| UN location code | 18 | 3*6 Bit characters |
| Fairway section number | 30 | 5*6 Bit characters |
| Terminal code | 30 | 5*6 Bit characters |
| Fairway hectometre | 30 | 5*6 Bit characters |
| RTA at lock/bridge/terminal | 20 | Recommended Time of Arrival MMDDHHMM UTC Bits 19 – 16: month 1 – 12; 0 = not available = default Bits 15 – 11: day 1 – 31 0 = not available = default Bits 10 – 6: hour 0 – 23 24 = not available = default Bits 5 – 0: minute 0 – 59 60 = not available = default |
| Lock/bridge/terminal status | 2 | 0 = operational 1 = limited operation (e.g. obstructed by technical conditions, only one lock chamber available, etc.) 2 = out of order 3 = not available |
| Spare | 2 | Not used, should be set to zero. Reserved for future use. |
| 232 | occupies 2 slots |