NAVTEX

NavTex (which comes from NAVigational TELEX), is used for the automatic broadcast of local maritime information using radio telex (also known as Narrow Band Direct Printing, or NBDP). It transmits on a fixed international waveband: 518 kHz. A NAVTEX receiver consists of an integrated printer, display and keyboard. Once programmed with appropriate station codes and subject indicator characters, the unit is left unattended - messages are received automatically and printed on the integrated printer. An alarm is preset to go off whenever urgent messages are received.