Text telegram using 6-bit ASCII

Introduction/Additional information: 

This IFM should be used by a ship or base station to send 6-bit ASCII text telegram to other AIS stations. The text telegram can be sent with either binary message 6 or 8. The acknowledge required flag should not be set when using the broadcast message 8. Replaced by ITU-R.M.1371-3

Registrant: 
ITU-R.M.1371-1
Message number: 
8
DAC: 
1
FI: 
0
State: 
replaced
Number of slots (max): 
5
Permitted as from: 
01/01/1998
Not to be used after: 
31/05/2007
Details: 
TABLE 26
International function message 0 using Message 8, broadcast binary message
Parameter Number of bits Description
Message ID 6 Identifier for Message 8; always 8
Repeat indicator 2 Used by the repeater to indicate how many times a message has been repeated. See ยง 4.6.1, Annex 2; 0-3; 0 = default;
3 = do not repeat any more
Source ID 30 MMSI number of source station
Spare 2 Not used. Should be zero
DAC 10 International DAC = 110 = 00000000012
FI 8 Function identifier = 010 = 0000002
Acknowledge required flag 1 1 = reply is required
0 = reply is not required
Message sequence number 11 Sequence number to be incremented by the application
Text message 924 6-bit ASCII as defined in Table 14. When using this IFM, the number of slots used for transmission should be minimized taking into account the table below
Spare bits N Formula for inserting for spare bits
Total number of application data bits 936