When the information is sent by the master by means of radio, the master must commence with an indication of the nature of the danger to which it relates and must be preceded by the safety signal consisting, if the information is sent by radio telegraphy, of the group TTT in the Morse Code, repeated 3 times, with the letters of each group and the successive groups clearly separate from each other, or if the information is sent by radio telephony of the spoken word “ SECURITE “ (pronounce “SAY CURE-E-TAYâ€) repeated 3 times.