CQD, transmitted in Morse code as — · — · — — · — — · · is one of the first distress signals adopted for radio use. It was announced on January 7, 1904, by "Circular 57" of the Marconi International Marine Communication Company, and became effective, for Marconi installations, beginning February 1, 1904. Land telegraphs had traditionally used "CQ" to identify messages of interest to all stations along a telegraph line, and CQ had al… (More on Cqd)