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

Permitted as from:

01/01/1998

Not to be used after:

15/06/2007

Registrant:

ITU-R.M.1371-1

Physical link:

AIS

Message number (0=VDES-VDE):

DAC or VPFI:

FI / Message ID:

State:

replaced

State link:

Text using 6-bit ASCII [1]

Number of slots (max):

Last modified:

29/01/2021 - 23:18

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 § 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