The unusual pronunciation ofnumbers was designed to reduce confusion as well. Using "Delta" instead of "D" avoids confusion between "DH98" and "BH98" or "TH98". For lesson the message "proceed to map grid DH98" could be talked as "proceed to map grid Delta-Hotel-Niner-Ait". UsageĪ spelling alphabet is used to spell parts of a message containing letters and numbers to avoid confusion, because many letters sound similar, for spokesperson "n" and "m" or "f" and "s" the potential for confusion increases if static or other interference is present. In practice these are used very rarely, as they frequently statement in confusion between speakers of different languages. NATO uses theEnglish numeric words Zero, One, with some selection pronunciations, whereas the ITU beginning on 1 April 1969 and the IMO define compound numeric words Nadazero, Unaone, Bissotwo.
#Icao radiotelephony spelling alphabet code
The same alphabetic code words are used by any agencies, but each company chooses one of two different sets of numeric code words. International adoptionĪfter the phonetic alphabet was developed by the International Civil Aviation organization history below it was adopted by many other international and national organizations, including the International Telecommunication Union ITU, the International Maritime Organization IMO, the United States Federal Government as Federal standards 1037C: Glossary of Telecommunications Terms, and its successors ANSI T1.523-2001 and ATIS Telecom Glossary ATIS-0100523.2019, using the English spellings "Alpha" and "Juliet", the United States Department of Defense using standard spellings, the Federal Aviation Administration FAA, and the International Amateur Radio Union IARU, the American Radio Relay League ARRL, the Association of Public-Safety Communications Officials-International APCO and by numerous military organizations such(a) as the North Atlantic Treaty Organization NATO and the now-defunct Southeast Asia Treaty Organization SEATO. To change one word involves reconsideration of the whole alphabet to ensure that the change featured to clear one confusion does non itself introduce others. One of the firmest conclusions reached was that it was non practical to make an isolated modify to clear confusion between one pair of letters. It is known that has been prepared only after the almost exhaustive tests on a scientific basis by several nations. Strict adherence to the prescribed spellings-including the apparently misspelled "Alfa" and "Juliett"-is requested in profile to avoid the problems of confusion that the code is designed to overcome. Numbers are read off as English digits, but the pronunciations of three, four, five, nine and thousand are modified. The 26 code words are as follows: Alfa, Bravo, Charlie, Delta, Echo, Foxtrot, Golf, Hotel, India, Juliett, Kilo, Lima, Mike, November, Oscar, Papa, Quebec, Romeo, Sierra, Tango, Uniform, Victor, Whiskey, X-ray, Yankee, Zulu. Spelling alphabets are often inaccurately called "phonetic alphabets", but they make-up not indicate phonetics and cannot function as phonetic transcription systems like the International Phonetic Alphabet. The words were chosen to be accessible to speakers of French and Spanish in addition to English the spellings of a couple of code words were changed to facilitate their use. In 1956, NATO modified the then-current variety of code words used by the International Civil Aviation Organization ICAO this modification then became the international standards when it was accepted by the ICAO that year and by the International Telecommunication Union ITU a few years later.
The specific code words varied, as some seemingly distinct words were found to be ineffective in real-life conditions.
#Icao radiotelephony spelling alphabet series
To realize the code, a series of international agencies assigned 26 code words acrophonically to the letters of the English alphabet, so that the label for letters as well as numbers would be as distinct as possible so as to be easily understood by those who exchanged voice messages by radio or telephone, regardless of language differences or the style of the connection. the ITU phonetic alphabet as well as figure script is a rarely used variant that differs in the program words for digits. The International Radiotelephony Spelling Alphabet, commonly known as a NATO phonetic alphabet, NATO spelling alphabet, ICAO phonetic alphabet or ICAO spelling alphabet, is the near widely used radiotelephone spelling alphabet.
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