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 - 5.1 Overview of technical characters, B1, B2, B3, B4
5.1 Overview of technical characters, B1, B2, B3, B4
5.1.1 NAVTEX messages include instructions to the NAVTEX receiver for processing maritime safety information in the form of the NAVTEX message identity, which consists of four technical "B" characters which make up an alphanumeric code. In order for messages to be correctly processed, they must consist of data conforming to these B characters:
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B1 Transmitter Identification Character
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B2 Subject Indicator Character
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B3B4 Message Numbering Characters
Table 1 Technical "B" characters which make up the full NAVTEX message identity
| B1 Transmitter Identification Character | B2 Subject Indicator Character | B3 B4 Message Numbering Characters | |
| 1 letter | 1 letter | 2 digits | |
| A to X | A = | Navigational warnings | 01 to 99 (message numbering characters "00" are not to be used for routine messages) |
| B = | Meteorological warnings | ||
| C = | Ice reports | ||
| Dfootnote = | Search and rescue information, acts of piracy warnings, tsunamis and other natural phenomena | ||
| E = | Meteorological forecasts | ||
| F = | Pilot and VTS service messages | ||
| G = | AIS service messages (non navigational aid) | ||
| H = | LORAN messages | ||
| I = | currently not used | ||
| J = | GNSS messages | ||
| K = | Other electronic navigational aid system messages | ||
| L = | Other Navigational warnings – additional to B2 character Afootnote | ||
| M = | currently not used | ||
| N = | |||
| O = | |||
| P = | |||
| Q = | |||
| R = | |||
| S = | |||
| T = | |||
| U = | |||
| V = | Special services allocation by the IMO NAVTEX Co-ordinating Panel | ||
| W = | |||
| X = | |||
| Y = | |||
| Z = | No messages on hand | ||
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