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It is 3 NOT 7 as previously answered.
A maroon is a type of firework used as a distress signal. See Chambers Dictionary.
Photoflash is used for illuminating terrain for night time.
Pyrotechnic visual distress devices are used to signal distress, usually at sea, or due to an accident in the mountains. Orange smoke flares during daylight, and bright white light flares during darkness.
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mostly 3 must be on board
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It is 3 NOT 7 as previously answered.
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SOS can be defined as the commonly used description for the international Morse code distress signal. This distress signal was first adopted by the German government in radio German regulations effective April 1, 1905, and became the worldwide standard under the second International Radiotelegraphic Convention, which was signed on November 3, 1906 and became effective on July 1, 1908. SOS remained the maritime radio distress signal until 1999, when it was replaced by the Global Maritime Distress Safety System. SOS is still recognized as a visual distress signal.
sos
Mayday
SOS means Save Our Ship, which is a distress signal used obviously by ships in distress at the ocean.
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it was destress rockets