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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.
A ship flying no flags may also be understood to be in distress. [6] For one country, the Philippines, an inverted flag is a symbol of war rather than distress. [7] If any flag is available, distress may be indicated by tying a knot in it and then flying it upside-down, making it into a wheft. [8]
Fishermen rely on mayday calls for emergency help at sea —know how to make one when needed.
In addition to distress signals like Mayday and pan-pan, most vessels, especially passenger ships, use some emergency signals to alert the crew on board.In some cases, the signals may alert the passengers to danger, but, in others, the objective is to conceal the emergency from unaffected passengers so as to avoid panic or undue alarm.
The flag should not be flown with the union down, except in rare emergencies as a sign of distress. The flag should not touch anything beneath it including the ground, floor, water or merchandise.
Radio silence can be used in nautical and aeronautical communications to allow faint distress calls to be heard (see Mayday). In the latter case, the controlling station can order other stations to stop transmitting with the proword "Seelonce Seelonce Seelonce". (The word uses an approximation of the French pronunciation of the word silence ...
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Meaning "I, my vessel or a person aboard my vessel requires assistance but is not in distress." This overrides all but a mayday call, and is used, as an example, for calling for medical assistance or if the station has no means of propulsion. The correct usage is: Pan-Pan, Pan-Pan, Pan-Pan . All stations, all stations, all stations