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GENERAL PRINCIPLES OF NARROW BAND DIRECT PRINTING (NBDP) AND TELEX OVER RADIO (TOR) SYSTEMS. ABILITY TO USE MARITIME NBDP AND TOR EQUIPMENT IN PRACTICE

NARROW BAND DIRECT PRINTING (NBDP) 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.