Titanic Contacts the Carpathia (The Last Signals)

CQD (transmitted in Morse code ) is one of the first distress signals adopted for radio use. It was announced on 7 January 1904, by "Circular 57" of the Marconi International Marine Communication Company, and became effective, beginning 1 February 1904 for Marconi installations.
https://en.wikipedia.org/wiki/CQD