Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC.1/Circular.1403 – Revised NAVTEX Manual – (23 May 2011) - Annex - 5 NAVTEX Message Technical Characters - 5.4 B3 B4 – Message Numbering Characters (NAVTEX Number)
5.4 B3 B4 – Message Numbering Characters (NAVTEX Number)
5.4.1 Each message within each subject group, is allocated a two digit sequential serial number, beginning at 01 and ending at 99. The B3B4 message numbering characters together, are often referred to as the "NAVTEX number".
5.4.2 The NAVTEX number is solely allocated as a component of the NAVTEX message identity and should not be confused with (and bears no correlation to), the series identity and consecutive number of the NAVAREA or Coastal warning contained in the message.
5.4.3 Messages broadcast using NAVTEX number B3B4 = 00 cannot be rejected and will automatically override any selection of B1 transmitter identification characters as well as any B2 subject indicator characters selected on the NAVTEX receiver.
5.4.4 Use of NAVTEX number B3B4 = 00 must therefore be strictly controlled, since messages carrying it will always be printed or displayed every time they are received. Routine messages and service messages must never be allocated B3B4 = 00. The correct use of B2 characters A, B, D and L, will ensure that messages containing safety information will always be printed or displayed on first receipt.
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