Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC.1/Circular.1403 – Revised NAVTEX Manual – (23 May 2011) - Annex - 6 Message Identity
6 Message Identity
6.1 The individual NAVTEX message identity is the amalgamation of all four technical characters B1B2B3B4 (transmitter identification character/subject indicator character/message numbering characters).
6.2 When a message is received for the first time by a NAVTEX receiver, the message identity is recorded and stored in the memory for 72 hours. This ensures that subsequent transmissions of the same message are not re-printed or repeated in the display, unless they are re-received over 72 hours later. In the unlikely event that all 99 NAVTEX numbers for a particular subject group, from a particular transmitter, are in use at the same time, or have been allocated within the past 72 hours, an alternative B2 character must be utilized; for example, B2 = L has been set aside to be used for additional navigational warnings if all 99 NAVTEX numbers for subject group B2 = A are in use.
6.3 Each NAVTEX message identity shall be allocated by the relevant NAVTEX Co-ordinator, who is the authority responsible for the selection of information to be broadcast by each transmitter within each subject group. A single NAVTEX Co-ordinator may have more than one transmitter under their control. Specific advice on the use of alternative B2 subject indicator characters as mentioned in 6.2 above, can be provided by the IMO NAVTEX Co-ordinating Panel.
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