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Maritime call sign

From Wikipedia, the free encyclopedia

Soviet  Nuclear Icebreaker "Arktika" with call sign UKTY.
Soviet Nuclear Icebreaker "Arktika" with call sign UKTY.
USS Carl Vinson and JDS Ashigara displaying signal flags showing callsigns NCVV and JSRA, respectively
USS Carl Vinson and JDS Ashigara displaying signal flags showing callsigns NCVV and JSRA, respectively

Maritime call signs are call signs assigned as unique identifiers to ships and boats.

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 trans-Atlantic 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 US 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 M.V. Mesaba (call sign MMU) and the S.S. Californian (call sign MWL).[3] Its distress call CQD CQD CQD CQD CQD CQD DE MGY MGY MGY MGY MGY MGY position 41.44N 50.24W would be answered by a station aboard the Carpathia (call sign MPA).[4] 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 US naval ships are assigned callsigns 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[5]) before being assigned to the Atlanta Journal for use by its presumably unsinkable 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.[6] 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.

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 US wishing to have a radio licence anyway are under F.C.C. class SA: "Ship recreational or voluntarily equipped." 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.

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Transcription

Full mission bridge simulator Polaris by Kongsberg is a device that is installed on the most sophisticated ships at the present it is user-friendly and the crew quickly adapts to work on it The simulator can be used quite successfully on a plan of training students who are preparing themselves for the vocation of deck officer and subsequently a ship master but also for the training of already experienced Mariners with the lack of experience on a certain type or size of ship as well as for the training of pilots The display and integrated navigation system on the bridge where all devices are networked to assist the navigator in the conduct of the ship Electronic Chart Display and Information System Electronic navigation map which replaces the existing paper maps all ships must be equipped with the same in the near future. The map has two kinds of image displays raster and vector. IMO International Maritime Organization is linked to the electronic tickets and imposes the use a vector map in ECDIS due to the possibility of integration of the maps with other devices in the IBS Integrated Bridge System. Automatic Radar Plotting Aids It is a device used for the detection of other objects in the area and for avoiding them. The machine itself is connected to a Doppler log and Gyro compass it has the possibility of overlap with the navigation map which is good to verify the position of the ship. Central console consists of central display unit - It consists of other navigation devices networked to form integrated navigation system such as GPS/DGPS device for positioning the ship. AIS Automatic Identification System - a device that provides information about the ships in the area (the name of the ship, its call sign, MMSI number, etc.) Doppler log - a device for reading boat speed through the water Echo sounder - a device for determining the depth of the sea under the boat Magnetic compass repeater, Gyro compass repeater Inclinometer - a device which reads the tilt of the boat (left-right). Wind indicator - a device that gives us the relative wind speed and the wind direction, and it consists of Central command board therein lies the steering wheel, autopilot, engine telegraph BOW Thrust Controller, STERN Thrust Controller and VHF radio

See also

This page was last edited on 7 November 2018, at 21:24
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