It seems pretty straightforward -- you enable the function using the specified command line commands. Whenever the the radio
is tuned to 518khz and the right mode is selected, and the modem
is on, it will store Navtex messages as they come in. You then retrieve them with other command line commands. Looks like maximum stored messages 100, which is more than enough.
Anybody using this? Looks like a great system. The computer doesn't need to be running.