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2.16.4.3 LR input data and formats
The input data and formats are in form of two Long Range
interrogation sentences - LRI and LRF, see Table 2-5.
! The LRI-sentence contains the information needed to determine
if a reply needs to be constructed.
! The LRF-sentence identifies the information items that are
being requested.
Details of each sentence can be found in Ref. [3].
Table 2-5. LR input data and formats
Data IEC 61162-1 sentences
Long Range Interrogation
Type of request:
- Geographic area request
- AIS transponder request
LRI - Long Range Interrogation
Long Range Function identification
Requestor MMSI and Name
Request for:
- Ship's name, call sign and IMO number (A)
- Date and time of message composition (B)
- Position (C)
- Course over ground (E)
- Speed over ground (F)
- Destination and ETA (I)
- Draught (O)
- Ship / Cargo (P)
- Ship's length, breadth and type (U)
- Number of persons on board (W)
LRF - Long Range Function
2.16.4.4 LR output data and formats
The output data and formats are in form of four Long Range reply
sentences – LRF, LR1, LR2 and LR3, see Table 2-6.
! The LRF sentence provides the ”Function Reply Status” for the
requested information. Following is a list of ”Function Reply
Status” characters with the status:
2 = Information available and provided in the following
LR1, LR2 and LR3 sentences.
3 = Information not available from the AIS system.
4 = Information is available but not provided (i.e. restricted
access determined by ship’s master).
! The LR1 sentence identifies the destination for the reply and
contains the information items requested by the "A" function
identification character in the LRF sentence.
! The LR2 sentence contains the information items requested by
the "B, C, E, and F" function identification characters in the
LRF sentence.
! The LR3 sentence contains the information items requested by
the "I, O, P, U and W" function identification characters in the
LRF sentence.
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