SAFETY SIGNAL AND MESSAGES

In radiotelegraphy, the safety signal consist of three repetitions of the group TTT, the individual letters of each group and the successive group being clearly separated from each other. It shall be sent before the call.
In radiotelephony, the safety signal consist of the word “SECURITE” pronounced clearly as in French, spoken three times and transmitted before the call.
This safety signal indicates that the station is about to transmit a message containing an important navigation or important meteorological warning. Safety signal and call shall be sent on or more of the international distress frequencies (500, 2182 khz,156.8) Mhz or any other frequency which may be used in case of distress.
The safety message which follows the call should be sent on a working frequency. A suitable announcement to this effect shall be made at he end of the call. In the maritime mobile service, safety messages shall generally be addressed to all stations. In some cases, however, they may be addressed to a particular station. All stations hearing the safety signal shall listen to the safety message until they are satisfied that the message is of no concern to them. They shall not make any transmission likely to interfere with the message.