Route suggestion
Route suggestion allows for a shore authority to suggest a route segment to a vessel.
Broadcasting 16 waypoints will result in a 5-slot message. It is recommended to avoid messages with more than 3 slots, equivalent to no more than 7 waypoints.
See http://enav.frv.dk/ais_route_suggestion.pdf(link is external) for usage and portrayal details.
See http://enav.frv.dk/ais_route_suggestion.pdf(link is external) for usage and portrayal details.
Jens Kristian Jensen
Danish Maritime Authority
JKJ@dma.dk(link sends e-mail)
Table 3.1
Route suggestion (addressed)
| Parameter | No. Of bits | 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. 0 – 3 0 = default 3 = do not repeat anymore |
| Source ID | 30 | MMSI number of source station. |
| Sequence Number | 2 | 0 – 3; refer to ITU-R M.1371-3, Annex 2, § 5.3.1. |
| 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. Set to zero. |
| IAI | 16 | DAC = 219; FI = 2 |
| Message Linkage ID | 10 | A source specific running number, unique across all binary messages equipped with Message Linkage ID. Used to link additional information to the message by a Text Description message. The Message Linkage ID and the first six digits of the source MMSI uniquely identify the sent message.
1 – 1,023
Furthermore the id is a unique identifier for the route suggestion. Each route suggestion must use a unique identifier. Subsequent responses to the suggestion will use this identifier. |
| Route Type | 5 | 1 = mandatory route
2 = recommended route 3 = alternative route |
| ETA first WP | A proposed ETA at the first waypoint. This allows a timing dimension in the suggestion. | |
| UTC Month | 4 | 1 – 12 0 = not available = default |
| UTC Day | 5 | 1 – 31 0 = not available = default |
| UTC Hour | 5 | 0 – 23 0 = not available = default |
| UTC Minute | 6 | 0 – 59 0 = not available = default |
| Duration | 18 | Minutes from ETA at first waypoint to ETA at the last waypoint. The duration allows for the calculation of an average proposed speed on the suggested route.
0 = not available = default |
| Number of Waypoints | 5 | Number of Waypoints
1 – 16 17 – 31 (not used) |
| Waypoints | n x 55 | Variable number of waypoints 1 – 16 (55 bit each), refer to table 2.2. |
| Spare | Not used. Set to zero. | |
| Total | 201 – 1,026 | Occupies 2 – 5 slots.
1 – 3 waypoints = 2 slots 4 – 7 waypoints = 3 slots 8 – 11 waypoints = 4 slots 12 – 16 waypoints = 5 slots |