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4. NAVTEX OPERATION: NAVNET
4-7
4.4.2 Remarks on navtex messages
• All navtex messages begin with “ZCZC” (navtex message ID) and end with
“NNNN”. Immediately following ZCZC, the transmitting station ID, message
category and message number are shown. In the example illustration at the
bottom of the previous page this data is “IA55.”
I = Transmitting station’s ID
A = Message category
55 = Message number
• An asterisk (*) is displayed in place of actual character when the character
could not be read.
• Message number 00 contains important emergency information.
• The FAX-30 holds 130 navtex messages. When the navtex message storage
capacity is exceeded, the oldest navtex message is automatically deleted to
make room for the latest.