International NAVTEX Service means the coordinated broadcast and automatic reception on 518 kHz of maritime safety information by means of narrow-band direct-printing telegraphy using the English language.
More details
NAVTEX is the automated direct-printing telegraph system for promulgation of navigational and meteorological warnings and urgent information to ships. NAVTEX provides ships with navigational and meteorological warnings and urgent information by automatic print-outs from a dedicated receiver. NAVTEX is a component of the World-Wide Navigational Warning Service (WWNWS) adopted by Assembly resolution A.419 (XI) and a requirement of the global maritime distress and safety system (GMDSS). Every ship shall be provided with a reciever capable of receiving international NAVTEX service broadcast if the ship engaged on voyages in any area in which an international NAVTEX service is provided. The principal features are as follows:
The service use a single frequency (518 kHz) on which coast stations transmit information in English on a time-sharing basis to prevent mutual interference. All necessary information is contained in each transmission.
The power of each coast station transmitter is regulated so as to avoid the possibility of interference between coast station.
Dedicated NAVTEX receivers are used which have the ability to select messages to be printed. according to a technical code (B1B2B3B4) which appears in the preamble of each message, and to reject messages other than certain essential classes of safety information which have already been received.
In order to ensure that ship using NAVTEX always receive the most vital information, receivers are unable to reject navigational warnings, meteorological warnings, search and rescue information and certain special warnings.
NAVTEX co-ordinators exercise control of messages transmitted by coast stations according to the information contained in each messages and the geographical cover required. A user may thus choose to accept messages either from single station transmitter which serves the sea area in which the ship is sailing, or from a number of coast station transmitters, as appropriate.
Samyung SNX-300
Model designed to IMO resolution and performance standards;
Display : 5.6”LCD;
English channel(518KHz) & local channel(490KHz/4209.5KHz) are simultaneously receiving by two receivers built-in;
Storage for over 200 advisory including 8,000 receiving letters in average length per channel;
Receiving messages sets-up from outer navigational equipment and channels;
50 messages permanently stored per channel and 72-hour-long storage of receiving letters;
Automatic power blockage run by voltage protection circuit;
Interfaced to INS(Integrated Navigation System) according to IEC-61162;
Compact and light design creates the easy installation available
