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A notice to mariners (NtM [1] or NOTMAR, [2]) advises mariners of important matters affecting navigational safety, including new hydrographic information, changes in channels and aids to navigation, and other important data. [3] Over 60 countries which produce nautical charts also produce a notice to mariners.
Each station transmits a NAVTEX broadcast six times a day, including two rebroadcasts of the general forecast. A NAVTEX broadcast includes maritime navigation warnings, weather forecasts, ice warnings, Gulf Stream locations, radio navigation information, rescue messages, and marine advisories. Each station has 2 NAVTEX transmitters.
Warnings are sent using methods such as NAVTEX and Inmarsat-C. [5] Once a warning is no longer relevant, the notice is cancelled. Longer-term hazards are converted into a notice to mariners. [5] The highest level of warning is a Navigational Area warning. There are also Sub-Area warnings, Coastal warnings, and Local warnings.
The Radio Navigational Aids (Publication 117) publication contains a detailed list of selected worldwide radio stations that provide services to the mariner. [1] The publication is divided into chapters according to the nature of the service provided by the radio stations. [ 1 ]
A NAVTEX receiver prints an incoming message NAVTEX message for the Baltic Sea. NAVTEX (NAVigational TEleX), sometimes styled Navtex or NavTex, is an international automated medium frequency direct-printing service for delivery of navigational and meteorological warnings and forecasts, as well as urgent maritime safety information (MSI) to ships.
Today, it operates just six ferries, down from its high of 11 a decade ago. Ridership has fallen off steeply. At its peak, the state's publicly owned ferries carried upward of 400,000 Alaskans and ...
Red flag warnings are in place for Southern California due to Santa Ana winds that will bring gusts up to 65 mph and “extremely rare and dangerous” fire weather conditions.
Special marine warning SMW – A warning to mariners of short-duration hazardous weather conditions (lasting up to two hours) including thunderstorms or squalls with wind gusts of 34 knots (39 mph; 63 km/h) or more, hail 1 inch (2.5 cm) diameter or larger, or waterspouts affecting coastal areas not adequately covered by existing marine warnings.