General Principles of Narrow Band Direct Printing (NBDP) and Telex Over Radio (TOR) systems. Ability to Use Maritime NBDP and TOR Equipment in Practice

Note: Narrow Band Direct Printing (NBDP) telegraphy is a means of communication whereby a printed or hard' copy is available at each communications terminal. NBDP is also known as radiotelex, and is used for NAVTEX broadcasts.



Ships at sea may communicate with shore-based telex machines by calling coast radio stations on frequencies specifically allocated for NBDP use. NAVTEX is a system utilising NBDP in the shore-ship direction only, for the broadcast of, for example, MSI.

NBDP Systems

Automatic Systems

Whenever possible automatic procedures should be used ...

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