IALA

Route information

Details:

 

Table 13.2

Route information – (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 = 001; FI = 28

(See Rec. ITU-R M.1371-3, Annex 5, § 2.1)

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
0 = not available = default

Sender Classification

3

0 = ship = default
1 = authority
2 – 7 (reserved for future use)
Route Type

5

0 = not available = default
1 = mandatory route
2 = recommended route
3 = alternative route
4 = recommended route through ice
5 = ship route plan
6 – 30 (reserved for future use)
31 = cancellation (cancel route as identified by Message Linkage ID)
Start Date and Time Start UTC date and time.
UTC Month

4

1 – 12
0 = not available = default
UTC Day

5

1 – 31
0 = not available = default
UTC Hour

5

0 – 23
24 = not available = default
UTC Minute

6

0 – 59
60 = not available = default
Duration

 

18

Minutes until end of validity of the route. Measured from start date and time of Route Information.

0 = cancel route
262,143 = not available = default

Number of Waypoints

5

Number of waypoints.

1 – 16
0 = no waypoint = default
17 – 31 (not used)

Waypoints

n x 55

Variable number of waypoints 1 – 16 (55 bit each), refer to Table 13.3. The number of waypoints is determined by the length of the message.
Spare Not used. Set to zero.
Total

204 – 1,029

Occupies 2 – 5 slots (see Table 13.4)

 

 

Table 13.3

Waypoints

 

Parameter No of bits
Description
WP i. Longitude

28

Longitude in 1/10,000 min,
±180 degrees as per 2’s complement (East = positive, West = negative).181 = not available = default
WP i. Latitude 27 Latitude in 1/10,000 min, ±90 degrees as per 2’s complement (North = positive, South = negative).

91 degrees = not available = default

 

Table 13.4

Number of slots

 

Number or waypoints transmitted 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Number of slots used for a broadcast message 2 2 2 2 3 3 3 3 4 4 4 4 5 5 5 5
Number of slots used for an addressed message 2 2 2 3 3 3 3 4 4 4 4 5 5 5 5 5