scope:

The present document states the minimum requirements for a Narrow-Band Direct-Printing (NBDP) maritime receiver operating in the NAVTEX system. The equipment's function is to receive and print automatically and continuously, meteorological and navigational messages and Search And Rescue (SAR) messages transmitted by coast stations participating in the NAVTEX system. The equipment shall consist of a radio-frequency receiver incorporating a signal processor and a printing device. The message format shall conform to ITU-R Recommendation 625-3 [1], collective B-mode. The system shall conform to ITU-R Recommendation 540-2 [2].