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Mayday is an emergency procedure word used internationally as a distress signal in voice-procedure radio communications. It is used to signal a life-threatening emergency primarily by aviators and mariners, but in some countries local organizations such as firefighters , police forces, and transportation organizations also use the term.
Procedure words (abbreviated to prowords) are words or phrases limited to radiotelephony procedure used to facilitate communication by conveying information in a condensed standard verbal format. [1] Prowords are voice versions of the much older procedural signs for Morse code which were first developed in the 1860s for Morse telegraphy , and ...
If a station does use Ch. 16 during distress operations controlling station issues the command "silence mayday". Using a set of international "calling" procedures such as the " Mayday " distress call, the " Pan-pan " urgency call and " Sécurité " navigational hazard call.
The international distress calls are standardised across land, sea, and air, and so the procedure for relaying a 'Mayday' in the air is the same as for maritime use, e.g., 'Mayday Relay, Mayday Relay, Mayday Relay ...' — Preceding unsigned comment added by 86.8.126.91 14:22, 5 September 2022 (UTC)
The radiotelephony message PAN-PAN is the international standard urgency signal that someone aboard a boat, ship, aircraft, or other vehicle uses to declare that they need help and that the situation is urgent, [1] [2] [3] but for the time being, does not pose an immediate danger to anyone's life or to the vessel itself. [4]
Sécurité (/ s eɪ ˈ k jʊər ɪ t eɪ /; French: sécurité) (often repeated thrice, "Sécurité, sécurité, sécurité") is a procedure word used in the maritime radio service that warns the crew that the following message is important safety information. The most common use of this is by coast radio stations before the broadcast of ...
This assigns full sentences to each of 48 different numbers, which are spelled out in the message and preceded by the procedure word "ARL". For example, "ARL FORTY SIX" is the brevity code for "Happy birthday", and is expanded upon delivery outside of the NTS system to "Greetings on your birthday and best wishes for many more to come.".
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