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Signalman 1 & C - Historic Naval Ships Association

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Figure 6-2.—Distress signals.A signal sent by radiotelephony consisting of thespoken word “Mayday”The international code signal of distress indicatedby NCA signal consisting of a square flag having aboveor below it a ball or anything resembling a ballFlames on the vessel (as from a burning tar barrel,oil barrel, and so forth.)A rocket parachute flare or a hand flare showing ared lightA smoke signal giving off orange-colored smokeSlowly and repeatedly raising and lowering armsoutstretched to each sideThe radiotelegraph alarm signalThe radiotelephone alarm signalSignals transmitted by emergency positionindicatingradio beaconsVessels in distress may use the radiotelegraphalarm signal or the radiotelephone alarm signal tosecure attention to distress calls and messages. Theradiotelegraph alarm signal, which is designed toactuate the radiotelegraph auto alarms of vessels sofitted, consists of a series of 12 dashes sent in 1 minute.6-13

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