IMO fairway closed. Specified in SN/Circ.236 Annex 2, page 5, Application 3. Also defined in IALA Guidelines on AIS, Vol 1, Part 1, Ed. 1.3. Guildeline No 1028. This message should be used to inform vessels about tidal windows which allow a vessel the safe passage of a fairway. The message includes predictions of current speed and current direction. In this example, three points of tidal information are given. Attributes of message: addressed, shore station transmitting, acknowledgement required.
| Name | NumberOfBits | ArrayLength | Type | Units | Description |
|---|---|---|---|---|---|
| MessageID | 6 | uint | AIS message number. Must be 6 | ||
| RepeatIndicator | 2 | uint | Indicated how many times a message has been repeated 0: default 3: do not repeat any more |
||
| UserID | 30 | uint | MMSI number of transmitter broadcasting the message | ||
| SeqNum | 2 | uint | Sequence number as described in 5.3.1. Assigned to each station | ||
| DestinationID | 30 | uint | Unique ship identification number (MMSI) | ||
| RetransmitFlag | 1 | bool | Should be set upon retransmission 0: no retransmission 1: restransmitted |
||
| Spare | 1 | uint | Must be 0 | ||
| dac | 10 | uint | Designated Area Code - part 1 of the IAI | ||
| fid | 6 | uint | Functional Identifier - part 2 of the IAI | ||
| month | 4 | uint | UTC month | ||
| day | 5 | uint | UTC day | ||
| window1_longitude | 28 | decimal | degrees | Not sure what this position is for? Center? East West location | |
| window1_latitude | 27 | decimal | degrees | Not sure what this position is for? Center? North South location | |
| fromhour1 | 5 | uint | hours | From UTC hour | |
| frommin1 | 6 | uint | minutes | From UTC minute | |
| tohour1 | 5 | uint | hours | To UTC hour | |
| tomin1 | 6 | uint | minutes | To UTC minute | |
| curdir1 | 9 | uint | degrees | Current direction | |
| curspeed1 | 7 | udecimal | knots | Current speed | |
| window2_longitude | 28 | decimal | degrees | Not sure what this position is for? Center? East West location | |
| window2_latitude | 27 | decimal | degrees | Not sure what this position is for? Center? North South location | |
| fromhour2 | 5 | uint | hours | From UTC hour | |
| frommin2 | 6 | uint | minutes | From UTC minute | |
| tohour2 | 5 | uint | hours | To UTC hour | |
| tomin2 | 6 | uint | minutes | To UTC minute | |
| curdir2 | 9 | uint | degrees | Current direction | |
| curspeed2 | 7 | udecimal | knots | Current speed | |
| window3_longitude | 28 | decimal | degrees | Not sure what this position is for? Center? East West location | |
| window3_latitude | 27 | decimal | degrees | Not sure what this position is for? Center? North South location | |
| fromhour3 | 5 | uint | hours | From UTC hour | |
| frommin3 | 6 | uint | minutes | From UTC minute | |
| tohour3 | 5 | uint | hours | To UTC hour | |
| tomin3 | 6 | uint | minutes | To UTC minute | |
| curdir3 | 9 | uint | degrees | Current direction | |
| curspeed3 | 7 | udecimal | knots | Current speed |