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Division Figure 5-1 Reference point for reported position of a maritime AtoN, or the dimension of an AtoN

United Kingdom

Original text. Later amendments are not shown.

Number of bitsBit FieldsDistance (m)
A9Bit 21 — Bit 29

0-511

511 — 511 m or greater

B9Bit 12 — Bit 20

0-511

511 — 511 m or greater

C6Bit 6 — Bit 11

0-63

63 — 63 m or greater

D6Bit 0 — Bit 5

0-63

63 — 63 m or greater

If the type of AtoN to be transmitted is covered within the existing IALA types of AtoN (according to Table 5.2) no changes need to be applied.

Notes on Division 5.2

Footnotes

f1

In case an inland AtoN type code is being transmitted, this field (type of AtoN) shall be set to 0 = undefined

f2

When using Figure 5-1 for AtoN the following shall be observed:

  • For fixed AtoN, virtual AtoN, and for offshore structures, the orientation established by the dimension A shall point to true north.

  • For floating aids larger than 2 m * 2 m the dimensions of the AtoN shall always be given approximated to a circle, i.e. the dimensions shall always be as follows A = B = C = D ≠ 0. (This is due to the fact that the orientation of the floating AtoN is not transmitted. The reference point for reported position is in the centre of the circle.)

  • A = B = C = D = 1 shall indicate objects (fixed or floating) smaller than or equal to 2 m * 2 m. (The reference point for reported position is in the centre of the circle.)

  • Floating offshore structures that are not fixed, such as rigs, shall be considered as Code 31 type from Table 5.2. These structures shall have their ‘Dimension/reference for position’ parameter as determined above in Note (1).

    For fixed offshore structures, Code 3 type from Table 5.2, shall have their ‘Dimension/reference for position’ parameter as determined above in Note (1). Hence, all offshore AtoN and structures have the dimension determined in the same manner and the actual dimensions are contained in Message 21.

f3

For Inland AIS AtoN report this field shall be used to indicate the Inland AtoN type using page 001

f4

When transmitting virtual AtoN information, i.e. the virtual/pseudo AtoN Target Flag is set to one (1), the dimensions shall be set to A = B=C = D = 0 (default). This shall also be the case, when transmitting ‘reference point’ information