Maritime call signs are call signs assigned as unique identifiers to ships and boats. All radio transmissions must be individually identified by the call sign. Merchant and naval vessels are assigned call signs by their national licensing authorities.
One of the earliest applications of radiotelegraph operation, long predating broadcast radio, were marine radio stations installed aboard ships at sea. 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. 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). "N" and two letters would identify U.S. Navy; "M" and two letters would be a Marconi station.
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 SS Mesaba (call sign MMU) and the SS Californian (call sign MWL). [1] 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). [2] 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.
Merchant and naval vessels are assigned call signs by their national licensing authorities. In the case of states such as Liberia or Panama, which are flags of convenience for ship registration, call signs for larger vessels consist of the national prefix plus three letters (for example, 3LXY, and sometimes followed by a number, i.e. 3LXY2). United States merchant vessels are given call signs beginning with the letters "W" or "K" while U.S. naval ships are assigned call signs beginning with "N". Originally, both ships and broadcast stations were given call signs in this series consisting of three or four letters, but as demand for both marine radio and broadcast call signs grew, gradually American-flagged vessels were given longer call signs with mixed letters and numbers.
As broadcast stations became commonplace in the 1920s, some original three- and four-letter call signs were reassigned as the corresponding ships were removed from U.S. registry. The WSB call sign had been held by two ships (the SS Francis H. Leggett, shipwrecked off Oregon's coast on September 18, 1914, and later the Firwood, a ship destroyed by fire near Peru on December 18, 1919 [3] ) before being assigned to The Atlanta Journal for use by its Atlanta, Georgia, broadcast radio station in 1922. Similarly, WEZU, the international radio call sign of the ship SS Lash Atlantico, was assigned in 1997 to a broadcast station. [4] Additional call signs would be reassigned to coastal stations or moved from marine radio to terrestrial broadcast radio when ships were sold for registration to foreign nations, as the new owners would obtain new, local call signs for any existing shipboard radio stations.
In the U.S., leisure craft with VHF radios may not be assigned call signs, in which case the name of the vessel is used instead. Ships in the U.S. wishing to have a radio licence anyway are under FCC Radio Service Code SA: "Ship Recreational or Voluntarily Equipped". [5] Those calls follow the land mobile format of the initial letter K or W followed by 1 or 2 letters followed by 3 or 4 numbers (such as KX0983 or WXX0029).
U.S. Coast Guard small boats have a number that is shown on both bows (i.e. port and starboard) in which the first two digits indicate the nominal length of the boat in feet. For example, Coast Guard 47021 refers to the 21st in the series of 47-foot motor lifeboats. The call sign might also be abbreviated to the final two or three numbers during operations, for example: Coast Guard zero two one.
SOS is a Morse code distress signal, used internationally, originally established for maritime use. In formal notation SOS is written with an overscore line, to indicate that the Morse code equivalents for the individual letters of "SOS" are transmitted as an unbroken sequence of three dots / three dashes / three dots, with no spaces between the letters. In International Morse Code three dots form the letter "S" and three dashes make the letter "O", so "S O S" became a common way to remember the order of the dots and dashes. IWB, VZE, 3B, and V7 form equivalent sequences, but traditionally SOS is the easiest to remember.
CQD is one of the first distress signals adopted for radio use. On 7 January 1904 the Marconi International Marine Communication Company issued "Circular 57", which specified that, for the company's installations, beginning 1 February 1904 "the call to be given by ships in distress or in any way requiring assistance shall be 'C Q D' ".
John George Phillips, known as Jack Phillips was a British sailor and the senior wireless operator aboard the Titanic during her ill-fated maiden voyage in April 1912.
Harold Sydney Bride was a British merchant seaman and the junior wireless officer on the ocean liner RMS Titanic during her ill-fated maiden voyage.
Marine VHF radio is a worldwide system of two way radio transceivers on ships and watercraft used for bidirectional voice communication from ship-to-ship, ship-to-shore, and in certain circumstances ship-to-aircraft. It uses FM channels in the very high frequency (VHF) radio band in the frequency range between 156 and 174 MHz, inclusive, designated by the International Telecommunication Union as the VHF maritime mobile band. In some countries additional channels are used, such as the L and F channels for leisure and fishing vessels in the Nordic countries. Transmitter power is limited to 25 watts, giving them a range of about 100 kilometres.
RMS Republic was a steam-powered ocean liner built in 1903 by Harland and Wolff in Belfast, and lost at sea in a collision in 1909 while sailing for the White Star Line. The ship was equipped with a new Marconi wireless telegraphy transmitter, and issued a CQD distress call, resulting in the saving of around 1,500 lives. Known as the "Millionaires' Ship" because of the number of wealthy Americans who traveled by her, she was described as a "palatial liner" and was the flagship of White Star Line's Boston service. This was the first important marine rescue made possible by radio, and brought worldwide attention to this new technology.
CQ is a station code used by wireless operators derived from long established telegraphic practice on undersea cables and landlines, particularly used by those communicating in Morse code,, but also by voice operators, to make a general call. Transmitting the letters CQ on a particular radio frequency means that the transmission is a broadcast or "General Call" to anyone listening, and when the operator sends "K" or says "Go Ahead" it is an invitation for any licensed radio station listening on that frequency to respond. Its use on radio matched the existing use on Morse landline telegraphy and dates from the earliest wireless stations. It was widely used in point-to-point diplomatic and press services, maritime, aviation, and police services until those services eliminated Morse radiotelegraphy. It is still widely used in amateur radio which still has active use of Morse radiotelegraphy.
Commander Charles Herbert Lightoller, was a British mariner and naval officer who was the second officer on board the RMS Titanic. During the ship's sinking, and as the officer in charge of loading passengers into lifeboats on the port side, Lightoller strictly enforced the women and children only protocol, not allowing any male passengers to board the lifeboats unless they were needed as auxiliary seamen. He was the most senior officer to survive the disaster. Lightoller served as a commanding officer in the Royal Navy during World War I and was twice decorated for gallantry. During World War II, in retirement, he voluntarily provided his personal yacht, the Sundowner, and sailed her as one of the "little ships" in the Dunkirk evacuation.
In broadcasting and radio communications, a call sign is a unique identifier for a transmitter station. A call sign can be formally assigned by a government agency, informally adopted by individuals or organizations, or even cryptographically encoded to disguise a station's identity.
Harold Thomas Cottam was a British wireless operator on the RMS Carpathia who fortuitously happened to receive the distress call from the sinking RMS Titanic on 15 April 1912. Cottam's decision to awaken Captain Arthur Henry Rostron and relay Titanic's message in spite of the scepticism of the officer on watch allowed Carpathia to arrive at the scene hours before any other ship and is "credited with saving hundreds of lives." He was a personal friend of the Titanic's wireless operators Harold Bride and Jack Phillips.
The Wireless Ship Act of 1910, formally titled "An Act to require apparatus and operators for radio-communication on certain ocean steamers" and also known as the "Radio Ship Act of 1910" and the "Radio Act of 1910", was the first federal legislation regulating radio communication in the United States. It required certain ocean-going vessels exiting U.S. ports to carry radio equipment, and although it did not require stations or operators to be licensed, it did require certification that operators and radio equipment met minimum standards.
RMS Titanic sank in the early morning hours of 15 April 1912 in the North Atlantic Ocean, four days into her maiden voyage from Southampton to New York City. The largest ocean liner in service at the time, Titanic had an estimated 2,224 people on board when she struck an iceberg at around 23:40 on Sunday, 14 April 1912. Her sinking two hours and forty minutes later at 02:20 ship's time on Monday, 15 April, resulted in the deaths of more than 1,500 people, making it one of the deadliest peacetime maritime disasters in history.
RMS Titanic was a British passenger and mail carrying ocean liner, operated by the White Star Line, that sank in the North Atlantic Ocean on 15 April 1912 as a result of striking an iceberg during her maiden voyage from Southampton, England, to New York City, United States. Of the estimated 2,224 passengers and crew aboard, about 1,500 died, making it the deadliest sinking of a single ship up to that time. The disaster drew public attention, spurred major changes in maritime safety regulations, and inspired many artistic works.
The sinking of the Titanic resulted in the following changes in maritime policy:
Herbert James Haddock was an English naval reserve officer and ship's captain, and was best known as the captain of the RMS Olympic at the time of the sinking of the Titanic. He was the first person to captain Titanic, overseeing the ship at Belfast while her delivery-trip crew was assembling there from 25 to 31 March 1912.
There have been several legends and myths surrounding the RMS Titanic and its destruction after colliding with an iceberg in the Atlantic Ocean. These have ranged from stories involving the myth about the ship having been described as "unsinkable" to the myth concerning the final song played by the ship's musicians.
Call signs in Canada are official identifiers issued to the country's radio and television stations. Assignments for broadcasting stations are made by the Canadian Radio-television and Telecommunications Commission (CRTC), while amateur stations receive their call signs from Innovation, Science and Economic Development Canada. Conventional radio and television broadcasting stations assignments are generally three, four or five letters long and almost exclusively use "C" call signs; with a few exceptions noted below, the "V" calls are restricted to specialized uses such as amateur radio.
Call signs in the United States are identifiers assigned to radio and television stations, which are issued by the Federal Communications Commission (FCC) and, in the case of most government stations, the National Telecommunications and Information Administration (NTIA). They consist of from 3 to 9 letters and digits, with their composition determined by a station's service category. By international agreement, all call signs starting with the letters K, N and W, as well as AAA-ALZ, are reserved exclusively for use in the United States.
A ship identifier refers to one of several types of identifiers used for maritime vessels. An identifier may be a proper noun ; a proper noun combined with a standardized prefix based on the type of ship ; a serial code; a unique, alphanumeric ID ; or an alphanumeric ID displayed in international signal flags. Some identifiers are permanent for a ship while others may be changed at the owners' discretion although regulatory agencies will need to approve the change. Modern ships usually have several identifiers.
SS Birma was a British-built transatlantic passenger ship. She was built in 1894 by Fairfield Shipbuilding and Engineering Company in Govan, United Kingdom, as Arundel Castle and later went through numerous ownership and name changes, including coming into the hands of the Russian American Line. In 1912, Birma was one of the ships to respond to the sinking of RMS Titanic. She was broken up in 1924 following acquisition by a German line after a liquidation sale.