![]() ![]() In January 1959, the First Assembly of IMCO decided that the organization should assume all the functions then being performed by the Standing Committee of the International Code of Signals. Īfter World War II, the 1947 International Radio Conference of the International Telecommunication Union suggested in that the International Code of Signals should fall within the competence of the Inter-Governmental Maritime Consultative Organization (IMCO), which became the IMO. The numerals 6, 7, 8, 9, and 0 were introduced by five new flags, and there were three new substitute flags added. Thirteen new flags were introduced, whereby the triangular pennants used for letters, C, D, E, F, and G were replaced with new square flags, and became the numerals 1, 2, 3, 4, and 5. The new international code of signals was officially brought into force worldwide on 1 January 1934. A certain number of signals were also inserted for communications between vessels and shipowners, agents, repair yards, and other maritime stakeholders. The new version introduced vocabulary for aviation and a complete medical section with the assistance and by the advice of the Office International d'Hygiène Publique. The Madrid Conference also set up a standing committee for continual revision of the code. ![]() This new edition was completed in 1930 and was adopted by the International Radiotelegraph Conference held in Madrid in 1932. The 1927 International Radiotelegraph Conference in Washington considered proposals for a new revision of the Code, including preparation in seven languages: English, French, Italian, German, Japanese, Spanish, and Norwegian. The group suggested revisions to the International Code of Signals, and adopted a phonetic spelling alphabet, but the creation of the organization was not agreed upon. The code was severely tested during World War I, and it was found that, "when coding signals, word by word, the occasions upon which signaling failed were more numerous than those when the result was successful." A 1920 meeting of the five Principal Allied and Associated Powers met in Paris and proposed forming the Universal Electrical Communications Union on Octoin Washington, D.C. Otherwise the letters appear to correspond to the more modern formats. Charlie, Delta, Echo, Foxtrot and Golf were pennants corresponding to more modern numeral pennants 1, 2, 3, 4 and 5. Ī slightly different version was published in Brown's Signalling, 18th Edition, February, 1916, pages 9-28. The eight new flags represented the vowels A E I O U and the letters X Y Z. In this new edition, the number of flags was increased from 18 flags plus a code pennant to 26 flags and a code pennant. At first it was used concurrently with the old system until 1 January 1902, and then used exclusively after 1 January 1903. The new international code of signals officially came into worldwide operation on 1 January 1901. It was revised by the Board of Trade in 1887, and was modified at the International Conference of 1889 in Washington, D.C. Vowels were omitted from the set to avoid spelling out any word that might be objectionable in any language, and some little-used letters were also omitted. Eighteen separate signal flags (see chart) were used to make over 70,000 possible messages. It came in two parts: the first containing universal and international signals, and the second British signals only. What is now the International Code of Signals was drafted in 1855 by the British Board of Trade and published in 1857 as the Commercial Code. The International Code of Signals was preceded by a variety of naval signals and private signals, most notably Marryat's Code, the most widely used code flags prior to 1857. ![]()
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