 It is normal practice to broadcast the Sécurité call itself on a distress and listening frequency such as VHF Channel 16 or MF 2182 kHz, and then change frequency to a working channel for the body of the messages.An equivalent Morse code signal is TTT, with each letter sent distinctly.Although mostly used by coast radio stations, there is nothing to stop individual craft broadcasting their own Sécurité messages where appropriate, for example, a yacht becalmed (rendered motionless for lack of wind), or any vessel adrift or unable to manoeuvre near other craft or shipping lanes.