What are lists of Distress signals by ships as per International Regulation for preventing collision at sea?

Distress signals to be used or displayed, either together or separately, by a vessel (or seaplane on the water) in distress requiring assistance from other vessels or from the shore.

  1. A gun or other explosive signal fire at intervals of about a minute.
  2. A continuous sounding with any fog-signaling apparatus.
  3. Rockets or shells, throwing red stars fired one at a time at short intervals.
  4. A signal made by radiotelegraphy or by any other signaling method consisting of the group • • • – – – • • • SOS in the Morse Code.
  5. A signal sent by radiotelephony consisting of the spoken word “MAYDAY”.
  6. The International Code Signal of distress indicated by NC.
  7. A signal consisting of a square flag having above or below it a ball or anything resembling a ball.
  8. Flames on the vessel (as from a burning tar barrel, oil barrel, etc.).
  9. A rocket parachute flare or a hand flare showing a red light.
  10. A smoke signal giving off a volume of orange-colored smoke.
  11. Slowly and repeatedly raising and lowering arms outstretched to each side.
  12. The radiotelegraph alarm signal.*
  13. The radiotelephone alarm signal.**
  14. Signals transmitted by emergency position-indicating beacons.***


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