This message is primarily intended for scheduled binary data transmissions by applying either the SOTDMA or ITDMA access scheme. This multiple slot binary message can contain up to 1 004 data-bits (using 5 slots) depending on the coding method used for the contents, and the destination indication of broadcast or addressed. See application identifiers in § 2.1, Annex 5.
This message should not be acknowledged by either Message 7 or 13.
|Parameter||Number of bits||Description|
|Message ID||6||Identifier for Message 26; always 26|
|Repeat indicator||2||Used by the repeater to indicate how many times a message has been repeated. Refer to § 4.6.1, Annex 2; 0-3; default = 0; 3 = do not repeat any more|
|Source ID||30||MMSI number of source station|
|Destination indicator||1||0 = Broadcast (no Destination ID field used)
1 = Addressed (Destination ID uses 30 data bits for MMSI)
|Binary data flag||1||0 = unstructured binary data (no Application Identifier bits used)
1 = binary data coded as defined by using the
16-bit Application identifier
|Destination ID||0/30||Destination ID (if used)||If Destination indicator = 0 (Broadcast); no data bits are needed for the Destination ID.
If Destination indicator = 1; 30 bits are used for the Destination ID and 2 spare bits for byte alignment.
|Spare bits||0/2||Spare (if Destination ID used)|
|Binary data||Broadcast Maximum 104||Application identifier
|16 bits||Should be as described in § 2.1, Annex 5|
|Addressed Maximum 72||Application binary data||Broadcast Maximum 88 bits
Addressed Maximum 56 bits
|Application specific data|
|Binary data added by 2nd slot||224||Allows for 32 bits of bit-stuffing|
|Binary data added by 3rd slot||224||Allows for 32 bits of bit-stuffing|
|Binary data added by 4th slot||224||Allows for 32 bits of bit-stuffing|
|Binary data added by 5th slot||224||Allows for 32 bits of bit-stuffing|
|Spare||4||Needed for byte alignment|
|Communication state selector flag||1||0 = SOTDMA communication state follows
1 = ITDMA communication state follows
|Communication state||19||SOTDMA communication state (see § 220.127.116.11.1, Annex 2), if communication state selector flag is set to 0, or ITDMA communication state (§ 18.104.22.168.2, Annex 2), if communication state selector flag is set to 1|
|Maximum number of bits||Maximum 1 064||Occupies up to 3 slots, or up to 5 slots when able to use FATDMA reservations. For Class B “SO” mobile AIS stations the length of the message should not exceed 3 slots. Class B “CS” mobile AIS stations should not transmit|
Table 83 gives the maximum number of binary data-bits for settings of destination indicator and coding method flags, such that, the message does not exceed the indicated number of slots.
|Destination indicator||Binary data flag||Binary data (maximum bits)|