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 = 18

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 

Clearance date/time to
enter port

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

Name of port and berth

120

Name of the port and berth. Maximum 20 characters 6 bits ASCII as defined in ITU-R M. 1371-3, Table 44.
“@@@@@@@@@@@@@@@@@@@@” = not available = default

Destination

30

UN LOCODE; 5 characters 6 bits ASCII
"@@@@@" = not available = default

Longitude

25

Longitude in 1/1,000 min, ±180 degrees as per 2’s complement (East = positive, West = negative). 
181 = not available = default

Latitude

24

Latitude in 1/1,000 min, ±90 degrees as per 2’s complement (North = positive, South = negative).
91 degrees = not available = default

Spare

43

Not used. Set to zero.

Total

360

Occupies 2 slots