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 = 3

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

Referenced message

10

The suggestion id of the message responded to.

Response

6

0 = Accept – Ship intends to adjust active route
1 = Reject – Ship does not intend to adjust active route
2 = Noted – Ship acknowledges reception, but cannot, or will not, consider the suggestion.

Total

114

1 slot