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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): 
6
DAC or VPFI: 
1
FI / Message ID: 
3
State: 
in force
State link: 
Capability interrogation
Number of slots (max): 
1
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