NAVTEX

Part of the international Global Maritime Distress and Safety System (GMDSS), NAVTEX is a radio broadcasting system, transmitting at 518 kHz in the medium frequency band, which distributes textual weather information. It is intended to service vessels within 200 miles of shore, the 200 mile limit being widely used in navigation and seafaring, as in the [[Exclusive Economic Zone] or Air Defense Identification Zone.

The United Kingdom Hydrographic Office is coordinator for the the International Hydrographic Organization (IHO) Worldwide Navigational Warning Service (WWNWS). In addition, UKHO is the the NAVAREA I (NE Atlantic) Co-ordinator for the International Maritime Organization (IMO) and and the United Kingdom National Co-ordinator for issuing coastal navigational warnings.