![]() Later that same year, an international conference standardised radio call signs so that the first two letters would uniquely identify a transmitter's country of origin. Its distress call CQD CQD CQD CQD CQD CQD DE MGY MGY MGY MGY MGY MGY POSITION 41.44 N 50.24 W would be answered by a station aboard the RMS Carpathia (call sign MPA). On April 14, 1912, the RMS Titanic station MGY, busily delivering telegram traffic from ship's passengers to the coastal station at Cape Race, Newfoundland (call sign MCE), would receive warnings of ice fields from Marconi stations aboard the MV Mesaba (call sign MMU) and the SS Californian (call sign MWL). Navy "M" and two letters would be a Marconi station. These mimicked an earlier railroad telegraph convention where short, two-letter identifiers served as Morse code abbreviations to denote the various individual stations on the line (for instance, AX could represent Halifax). In the absence of international standards, early transmitters constructed after Guglielmo Marconi's first transatlantic message in 1901 were issued arbitrary two-letter calls by radio companies, alone or later preceded by a one-letter company identifier. One of the earliest applications of radiotelegraph operation, long predating broadcast radio, were marine radio stations installed aboard ships at sea. Merchant and naval vessels are assigned call signs by their national licensing authorities. All radio transmissions must be individually identified by the call sign. ![]() ![]() Maritime call signs are call signs assigned as unique identifiers to ships and boats. Call signs assigned as unique identifiers to ships and boats Soviet nuclear Icebreaker Arktika with call sign UKTY USS Carl Vinson and JS Ashigara displaying signal flags showing callsigns NCVV and JSRA, respectively ![]()
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