The letter "A" is represented by a dot followed by a dash: Spoken, short signals are referred to as "dih" and long signals are referred to as "dah". Morse Code is a way of "tapping" out letters using a series of dots (short signals) and dashes (long signals). The wireless telegraphers used Morse Code to send messages. Until then, ships at sea out of visual range were very much isolated from shore and other ships. Most of the general populace believes that "SOS" signifies "Save Our Ship." Casual students of radio history are aware that the use of "SOS" was preceded by "CQD." Why were these signals adopted? When were they used? The practical use of wireless telegraphy was made possible by Guglielmo Marconi in the closing years of the 19th century. GMDSS History There is much mystery and misinformation surrounding the origin and use of maritime distress calls. When Captain Smith gave the order to radio for help, first radio officer Jack Phillips sent "CQD" six times followed by the Titanic call letters, "MGY.” GMDSS History Second Radio Officer, and in the logs of the SS Carpathia, Titanic first used "CQD" to call for help. The need for ship and coast radio stations to have and use radiotelegraph equipment, and to listen to a common radio frequency for Morse encoded distress calls, was recognized after the sinking of the liner RMS TITANIC in the North Atlantic in 1912. GMDSS History Since the invention of the radio at the end of the 19th century, ships at sea have relied on MORSE CODE, invented by SAMUEL MORSE and first used in 1844, for distress and safety telecommunications. Morse is remembered for his Code, still used, and less for the invention that enabled it to be used, probably since landline telegraphy eventually gave way to wireless telegraphy. This was the seed out of which the electric telegraph grew. It was on this homeward voyage that he overheard a shipboard discussion on electromagnets. He returned to America in 1832 having been appointed Professor of Painting and Sculpture at the University of the City of New York. He spent the next ten years as an itinerant artist with a particular interest in portraiture. Educated at Phillip’s Academy at Andover, he graduated from Yale in 1810 and he lived in England from 1811 to 1815, exhibiting at the Royal Academy in 1813. He was not a scientist - he was a professional artist. GMDSS History Samuel Finley Breeze Morse was born in Charlestown, Mass. SOLAS 74/78 – Chapter IV contains the GMDSS provisions, which entered into on force 01 February 1992, with full implementation scheduled by 1 February 1999. Its many parts include satellite as well as advanced terrestrial communications systems. GMDSS History The Global Maritime Distress and Safety System (GMDSS) represents a significant improvement in marine safety over the previous system of short range and high seas radio transmissions. GMDSS is a global coverage and arrangement of communication systems for maritime distress and safety communication that search and rescue authorities, as well as shipping in the immediate vicinity of the ship or person in distress, as well be rapid alerted, so that they can assist in a coordinated search and rescue operation in minimum delay. GMDSS The GMDSS offers the greatest advancement in maritime safety since the enactment of regulations following the Titanic disaster in 1912. This will enable the student to know the basic emergency and distress procedures by INMARSAT System, Radio communications and Search and Rescue 2M LEONILO S. GMDSS Global Maritime Distress and Safety System
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