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NAVTEX (Navigational Telex) is an international automated service for delivery of meteorological and marine safety information to
ships. These broadcasts are sent with the SITOR collective B-mode (Also known as AMTOR-B or AMTOR-FEC), using the CCIR 476 character set. SITOR-B is also used in amateur radio, where it is known as AMTOR-B or AMTOR-FEC. It transmits at 100 baud FSK modulation with a frequency shift of 170 Hz. The frequencies are:
The implementation reflects this structure: The Navtex modem is a specialization of the SITOR-B modem. Fldigi supports both modes. We will specify when their behaviours are different. |
ZCZC B1B2B3B4These four characters are:
(message text ...)
NNNN
navtex.get_message | Returns next Navtex/SitorB message with a max delay in seconds passed as an integer parameter. Empty string if timeout. |
navtex.send_message | Send a Navtex/SitorB message, passed as a string. Returns an empty string if OK otherwise an error message |