What is Navtex?
NAVTEX is a system for the broadcast and automatic reception of maritime safety
information by means of a narrow-band direct-printing telegraphy. NAVTEX provides shipping
with navigational and meteorological warnings and urgent information through automatic
printouts from a dedicated receiver.
NAVTEX is a component of the IMO/IHO Worldwide Navigational Warning Service (WWNWS)
defined by IMO Assembly resolution A.706(17). It has also been included as an element of
the Global Maritime Distress and Safety System (GMDSS). Since 1 August 1993, NAVTEX
receiving capability has become part of the mandatory equipment which is required to be
carried in certain vessels under the provisions of the International Convention for the
Safety of Life at Sea (SOLAS).
How does it Work?
NAVTEX transmissions are sent via a single frequency from localized stations situated
worldwide. The power of each transmission is regulated so as to avoid the possibility of
interference between transmitters. Users can set their NAVTEX receivers to receive specific message types and reject others. Messages such as
navigational and meteorological warnings and search and rescue information are
non-rejectable to ensure that ships equipped with NAVTEX always receive the most vital
information. Users can choose to receive information from the single transmitter that
serves the sea area around their position, or from a number of transmitters. If you would
like to know more about how NAVTEX messages are created and transmitted you may find this pictorial representation helpful.
NAVTEX Coverage
NAVTEX messages are transmitted worldwide from local stations, the number of stations
grows month by month. We have produced a NAVTEX Database which
provides details about all known NAVTEX stations, details include name, position, range,
and operational status.
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