Simplex FEC, CCIR 476 alphabet, 7 bit; two or more stations on the same frequency, transmitting mode in FEC (Forward Error Correction); character interleaved, each character repeated after 350 msec.

Calling idle states:

SBRS (selective) beta in dx, and rx position

CBRS (collective) alpha in rx and rq in rx position.

 Click here for a small example of some typical SITOR B

An example of a typical NAVTEX message.....