The vowel-sequence thing works for most (though not all) combinations of letters.
#OLD INTERNATIONAL RADIOTELEPHONY SPELLING ALPHABET CODE#
Hence the sequence of vowels in the phonetic code played an important role when the code was invented, so that when you hear a noisy '-oo-oo' you know the letter is a Z. When the code was invented it was also considered that consonants are the most difficult to hear against a noisy background. The normal alphabet cannot be used, because some letters, for example P, B, C and D sound similar, and over long distances were indistinguishable, so a new method had to be found. The reason that any phonetic alphabet is (or was) used is because telephone, radio and walkie-talkie communications had the habit of crackling over long distances, blotting out whole words or even sentences. All the letters sound different, so there is no confusion over long distances over what people are saying.
It requires words to be spelled out by their letters for example, arm becomes Alpha Romeo Mike, and south becomes Sierra Oscar Uniform Tango Hotel. It has another name - the radiotelephony spelling alphabet. The phonetic alphabet is a system created by the NATO allies in the 1950s that would be intelligible and pronounceable to all NATO allies in the heat of battle. It did not start off like this - over time, the phonetic alphabet has evolved. Nevertheless, a NATO unclassified version of the document is provided to foreign, even hostile, militaries, even though they are not allowed to make it publicly available.In its current state, the NATO (North Atlantic Treaty Organisation) phonetic alphabet stands as is shown below: However, ATP-1 is marked NATO Confidential (or the lower NATO Restricted) so it is not publicly available. The name NATO phonetic alphabet became widespread because the signals used to facilitate the naval communications and tactics of the United States and NATO have become global. Because the latter allows messages to be spelled via flags or Morse code, it naturally called the code words used to spell out messages by voice its “phonetic alphabet”. The alphabet’s common name (NATO phonetic alphabet) arose because it appears in Allied Tactical Publication ATP-1, Volume II: Allied Maritime Signal and Maneuvering Book used by all allied navies in NATO, which adopted a modified form of the International Code of Signals. NATO uses the normal English numeric words (Zero, One, with some alternative pronunciations), whereas the IMO uses compound numeric words (Nadazero, Unaone). The same alphabetic code words are used by all agencies, but each agency chooses one of two different sets of numeric code words. It is a subset of the much older International Code of Signals (INTERCO), which originally included visual signals by flags or flashing light, sound signals by whistle, siren, foghorn, or bell, as well as one, two, or three letter codes for many phrases. It is used by many national and international organizations, including the International Civil Aviation Organization (ICAO), the International Telecommunication Union (ITU), the International Maritime Organization (IMO), the North Atlantic Treaty Organisation (NATO), the Federal Aviation Administration (FAA), and the American National Standards Institute (ANSI).
The paramount reason is to ensure intelligibility of voice signals over radio links. Instead, the NATO alphabet assigns code words to the letters of the English alphabet acrophonically so that critical combinations of letters (and numbers) can be pronounced and understood by those who transmit and receive voice messages by radio or telephone regardless of their native language, especially when the safety of navigation or persons is essential. Though often called “phonetic alphabets”, spelling alphabets have no connection to phonetic transcription systems like the International Phonetic Alphabet. The NATO phonetic alphabet, more formally the international radiotelephony spelling alphabet, is the most widely used spelling alphabet.
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