- 0420 - 0425 UTC, VCK ($04C), Sept-Iles-Riviere-au-Renard, Quebec, with navigation warnings. Good signal.
- 0426 - 0436 UTC, NMA ($04A), Miami FL, with navigational notices. Weak with garbled messages, but station identifier clear.
- 0445 UTC, NMF ($04F), Boston MA, with marine weather forecast for northeastern U.S. waters. Good signal.
Navtex is transmitted in a mode called SITOR-B. To receive Navtex, you need a receiver that supports SSB reception, and a computer to decode the signal. I use a software application called Frisnet Navtex Decoder to do the decoding.
Navtex stations on 518 kHz all broadcast in English. The world is divided into regions called Navareas. The stations within a Navarea take turns transmitting according to a predefined schedule. Each station in a Navarea identifies itself by a single letter (e.g., "A"). William Hepburn, at his DX Information Centre site, has a comprehensive list of the stations in each Navarea, with their identifiers and transmission schedules.
Navtex DXers identify stations using the format $NNI, where "$NN" is the Navarea number and "I" is the station's single letter identifier. For example, $04F is station "F" in Navarea 4, and from Hepburn's station list you can see this is station NMF in Boston, MA.
I also heard an aircraft navigation beacon on 516 kHz at the same time (0420 UTC): YWA in Petawawa, Ontario, with a fairly decent signal. This station is a regular visitor here in Toronto.