Signalman 1 & C - Historic Naval Ships Association

The duration of each dash is 4 seconds, and theduration of the interval between two consecutivedashes is 1 second. The radiotelephone alarm signalconsists of two tones transmitted alternately overperiods of from 30 seconds to 1 minute.The use of any of the foregoing signals except forthe purpose of indicating that a vessel or seaplane isin distress, and the use of other signals that may beconfused with any of the previously mentioned signalsare prohibited.Attention is drawn to the relevant sections of theMerchant Ship Search and Rescue Manual, and thefollowing signals:A piece of orange-colored canvas with either ablack square and circle or other appropriatesymbol (for identification from the air)A dye markerSignals used in situations of distress and searchand rescue are shown in figure 6-2 (Distress) andfigure 6-3 (Lifesaving signals).Figure 6-3.—Lifesaving signals (page 1 of 4).6-14