White high-intensity strobe light flashing at 60 times per minute.In North America, marine search and rescue agencies in Canada and the United States also recognize certain other distress signals: Displaying a visual signal consisting of a square flag having above or below it a ball or anything resembling a ball (round or circular in appearance)Ī floating man-overboard pole or dan buoy can be used to indicate that a person is in distress in the water and is ordinarily equipped with a yellow and red flag (international code of signals flag "O") and a flashing lamp or strobe light.Flying the international maritime signal flags NC.Firing a gun or other explosive signal at intervals of about a minute.Making a continuous sound with any fog-signaling apparatus.Raising and lowering slowly and repeatedly both arms outstretched to each side.Showing flames on the vessel (as from a burning tar barrel, oil barrel, etc.). Burning a red flare (either hand-held or aerial parachute flare).Sending the Morse code group SOS ( ▄ ▄ ▄ ▄▄▄ ▄▄▄ ▄▄▄ ▄ ▄ ▄ ) by light flashes or sounds.Transmitting a digital distress signal by activating (or pressing) the distress button (or key) on an Inmarsat-C satellite internet device.Transmitting a digital distress signal by activating (or pressing) the distress button on a marine radio equipped with Digital Selective Calling (DSC) over VHF channel 70 or over another designated DSC frequency in the maritime MF and HF bands.Transmitting a spoken voice Mayday message by radio over very high frequency channel 16 (156.8 MHz) or medium frequency on 2182 kHz.Most jurisdictions have large penalties for false, unwarranted, or prank distress signals.ĭistress can be indicated by any of the following officially sanctioned methods: Otherwise, urgent signals such as pan-pan can be sent. Mayday signals must only be used where there is grave and imminent danger to life. An EPIRB both notifies or alerts authorities and at the same time provides position indication information.ĭistress signals at sea are defined in the International Regulations for Preventing Collisions at Sea and in the International Code of Signals. A hand-held flare burns for three minutes and can be used to localize or pinpoint more precisely the exact location or position of the party in trouble.
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