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GMDSS for Navigators by Peter Smith, John Seaton

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THE GENERAL PRINCIPLES AND BASIC FEATURES OF THE MARITIME MOBILE SERVICE

 

TYPES OF COMMUNICATION IN THE MARITIME MOBILE SERVICE

Distress, Urgency, and Safety Communications traffic consists of all messages relating to the immediate assistance required by the ship in DISTRESS, including Search And Rescue (SAR) communications and on-scene communications. Distress traffic must be followed by all stations, even if they are not assisting, until it is clear that assistance is being rendered.

Public Correspondence is correspondence between ship stations and shore stations of a commercial nature, for example radiotelegrams and radiotelephone calls.

Port Operations Service is a maritime mobile service, in or near a port, between coast stations and ship ...

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