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