Then each marine radio station may warn each other to remain silent: in the radio with the message SILENCE MAYDAY, in the telegraph with the QRT SOS sign. ), or the emergency signal of an EPIRB.Mayday on radio or the telegraphy emergency signal SOS ( Long-term radio silence is mandatory as soon as an emergency call has been received, i.e. The times of radio silence are highlighted on the radio clock, which should be placed in the field of vision of the radio operator, by colored sectors (mostly red and green, sometimes blue instead of green). Radio ), which is mandatory on so-called “equipment-requiring” ships, twice an hour: from xx.15pm to xx.18pm and from xx.45pm to xx.48pmĭuring the radio silence, all radio communications with the exception of emergency communications must be avoided. on the international emergency frequency 500 kHz ( telegraph.on the international radio emergency and calling frequency (2182 kHz) twice an hour:įrom xx.00 a.m. ![]() ![]() In ship radio traffic, three-minute radio silences four times an hour are prescribed in order to be able to receive weak signals if necessary: Times of radio silence are marked in color:
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