IALA

Route suggestion

Introduction/Additional information:

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.

Registrant:
Danish Maritime Authority
Message number:
6
DAC:
219
FI:
2
State:
draft
Used by:
Danish Maritime Authority
EfficienSea
Number of slots (max):
5
Reporting Rate:
On demand
How portrayed:

See http://enav.frv.dk/ais_route_suggestion.pdf(link is external) for usage and portrayal details.

Permitted as from:
03/11/2011
Technical point of contact:

Jens Kristian Jensen
Danish Maritime Authority
JKJ@dma.dk(link sends e-mail)

Details:

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