Capability interrogation

Introduction/Additional information:

IFM 3 should be used by an application to interrogate (using Message 6) another application for the availability of application identifiers for the specified DAC. The request is made separately for each DAC.

IFM 3 can only be used as the data content of an addressed binary message.

Permitted as from:

16/06/2007

Registrant:

ITU-R.M.1371-3

Physical link:

AIS

Message number (0=VDES-VDE):

DAC or VPFI:

FI / Message ID:

State:

in force

State link:

Capability interrogation [1]

Number of slots (max):

Last modified:

29/01/2021 - 23:18

Details:

Parameter	Number of bits	Description
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. See § 4.6.1, Annex 2; 0-3; 0 = default; 3 = do not repeat any more
Source ID	30	MMSI number of source station
Sequence number	2	0-3; see § 5.3.1, Annex 2
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. Should be zero
DAC	10	International DAC = 1₁₀ = 0000000001₂
FI	6	Function identifier = 3₁₀ = 000011₂
Requested DAC code	10	IAI, RAI or test
Spare bits	70	Not used, should be set to zero, reserved for future use
Total number of bits	168	The resulting Message 6 occupies 1 slot