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Visual distress signals can be sent by flashing a light in the SOS pattern; that's 3dots(quick flashes) then 3 dashes (longer flashes) then 3 dots again. One naval instrument for doing this was the Aldis Lamp.

SOS signals can also be sent by semaphore, it being a system of using 2 flags in various positions such as 1 out to the right and 1 to the left (raised 45 degrees above the horizontal), different positions of the two flags together representing letters of the alphabet, or words.

People have laid out pebbles from the beach to spell out large SOS letters.

I expect the American Indians could send and understand the meanings of various smoke signals.

Flares of various colours can be shot into the air to give information. An aircraft pilot coming in to land when it was too dangerous to do so would see a red flare fired into the sky.(possibly because the pilot hadn't seen another plane just taking off)

From the Merchant Shipping (Distress signals and Preventions of collision )Regulations 1996. Annex IV Distress signals.The visual distress indications are:-
  • Flashing Morse SOS, by any method
  • Rockets or shells showing a red stars singly, at intervals.
  • International code flag signal showing 'N' 'C'
  • A square flag showing above or below it, a ball, or something resembling a ball.
  • Flames on the vessel, from a burning tar or oil barrel.
  • A rocket parachute flare or hand held flare showing a red light.
  • A smoke signal giving off orange colored smoke.
  • Slowly raising and lowering of 'out stretched' arms.
  • A large piece of orange canvas showing a black square and a circle on it or other appropriate symbol for recognition from the air.
  • A dye marker in the sea.

These signals are recognized Internationally at sea.

3rd Answerer says: You may also fly your country's National Flag upside-down as an internationally-recognized sign of distress.

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12y ago
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7y ago

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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8y ago

They're only visible over relatively short distances (line of sight). Radio signals travel much further.

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Q: Which is true of pyrotechnic visual distress devices?
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Related questions

Is a true of pyrotechnic visual distress devices?

They have an expiration date


What is always true of pyrotechnic visual distress devices?

They have an expiration date.


What is true of pyrotechnic visual distress devices?

They have an expiration date


Is true of pyrotechnic visual distress devices?

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.


What is a true pyrotechnic visual distress device?

They have an expiration date


What is true of a pyrotechnic visual distress devices?

Pyrotechnic visual distress devices are typically used to signal for help in emergency situations at sea or in the wilderness. These devices produce bright flashes of light or smoke to attract attention from rescuers. It is important to use them responsibly and follow proper safety precautions.


What statements is true concerning visual distress signals?

Pyrotechnic visual distress devices have an expiration date.


Is true of pyrotechnc visual distress devices?

have an expiration date


What statements are true concerning visual distress signals?

flares are rated for day, night or combined day/night use


What is true concerning visual distress signals for boating?

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