and D messages must always be printed once. B3 and B4 are the sequence num
-
ber for the message, and will have values from 00 throug 99. Messages with se
-
quence number 00 are always printed. When the messages numbers reach 99,
they wrap to 01 as the next number.
The following stations may be on the air and transmitting NAVTEX:
Halifax, Nova Scotia Guam
Boston, MA Honolulu, HI
New Orleans, LA Kodiak, AK
Miami, FL Astoria, OR
San Juan, Puerto Rico Long Beach, CA
Chesapeake, VA San Francisco, CA
For NAVTEX messages, the currently assigned message classes are as follows:
A Navigational warnings
B Meteorological warnings (storm warnings)
C Ice reports
D Search and Rescue Information
E Meteorological forecasts
F Pilot messages
G Decca message
H LORAN-C message
I Omega message
J Differential Omega message
Z QRU - no message on hand
K-Y Reserved
+
NOTE: K has been proposed for “other electronic navigational aid sys
-
tem message.”
Once a message has been received from a particular station with less than a spec
-
ified amount of errors, it will not be printed again, as the receiving system keeps
track of the message numbers it has received. If it then sees the same message
class and number from the same transmitting station, it will not output the mes
-
sage to the terminal.
For ARRL AMTEX bulletins, the defined B1 codes are as follows:
A ARRL issued bulletins
Non-Packet Modes of Communication NAVTEX Operation
User’s Guide 134 KAM’98 v 8.3
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