ISRS Text message

Introduction/Additional information:

The ISRS Text message can be used to transmit free text information which is related to any object which has an ISRS location code.

Additional Information / usage notes:

Spare bits shall be used as necessary to maintain byte boundaries.
If an ISRS text message shall be deleted then the text parameter shall be filled with two @ ASCII characters in a row as the first two characters.

Permitted as from:

25/06/2020

Registrant:

Physical link:

AIS

Message number (0=VDES-VDE):

DAC or VPFI:

200

FI / Message ID:

Version:

Technical point of contact:

RIS VTT

State:

proposal

Number of slots (max):

Last modified:

29/01/2021 - 23:19

Details:

	Parameter	Bit	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. Default = 0; 3 = do not repeat any more
	Source ID	30	MMSI number
	Spare	2	not used, should be set to zero, reserved for future use
Binary data	Application Identifier	16	DAC = 200, FI = 44
	Version indicator	3	The version number of the message default = 0, rest for future use
	UN country code	12	2*6 Bit characters, digits 1 and 2 of the ISRS code
	Fairway section number	17	bit coded numerical value 1-99999, 0=unknown, rest not used, digits 6 to 10 of the ISRS code
	Object code	30	5*6 Bit characters
	Fairway hectometre	17	bit coded numerical value 1-99999, 0=unknown, rest not used, digits 16 to 20 of the ISRS code
	Spare	1	reserved; should be set to 0
	Text	222- 450	37 to 75 x 6-bit ASCII as defined in ITU-R M.1371
	Spare	max 6	Not used for data and should be set to zero. Spare bits are needed to maintain byte boundaries. NOTE 1 – When a 6-bit spare is needed to satisfy the 8-bit byte boundary rule, the 6-bit spare will be interpreted as a valid 6‑bit character (all zeros is the “@” character).
	Total		Occupies 2 to 3 slots