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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 services include Radio direction finder and Radar Stations; stations broadcasting navigational warnings, time signals or medical advice; communication traffic for distress, emergency and safety including the Global Maritime Distress Safety System (GMDSS) and long range navigational aids. [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.
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.
When severe weather looms, storm alerts are important tools for keeping people informed. The National Weather Service shares alerts as it warns of potential risks from thunderstorms, flooding ...
The National Weather Service issues a similar high wind warning (Specific Area Message Encoding code: HWW) for high winds on land. The criteria vary from place to place; however, in most cases, the warning applies to winds of 40 miles per hour (64 km/h) to 73 miles per hour (117 km/h) for at least 1 hour; or any gusts of 58 miles per hour (93 km/h) to 114 miles per hour (183 km/h) on land.
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