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Letter flags and ICS meanings Letter / radio name Flag Blazon ICS meaning as single flag Meaning when used with numeric complements A Alfa: Swallowtailed, per pale argent and azure "I have a diver down; keep well clear at slow speed." Azimuth or bearing B Bravo: Swallowtailed, gules "I am taking in or discharging or carrying dangerous goods."
[12] It has done this by first establishing a standardized alphabet (the letters A to Z and the ten digits), along with a spoken form of each letter (to avoid confusing similar-sounding letters, such as b, p, and v), and associating this alphabet with standardized flags. (See chart to the right.)
The word nautical derives from the Latin nauticus, from Greek nautikos, from nautēs: "sailor", from naus: "ship". Further information on nautical terminology may also be found at Nautical metaphors in English, and additional military terms are listed in the Multiservice tactical brevity code article.
Code numbers 1–25 represented letters of the alphabet (omitting J and with V=20 before U=21); [8] higher numbers were assigned meanings by a code book. [9] The code numbers typically would have been hoisted on the mizzenmast , one after another, preceded by the "telegraphic flag" (a red over white diagonally-split flag) [ 10 ] to show that ...
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Naval flag signalling undoubtedly developed in antiquity in order to coordinate naval action of multiple vessels. In the Peloponnesian War (431 – 401 BCE) squadrons of Athenian galleys were described by Thucydides as engaging in coordinated maneuvers which would have required some kind of communication; [1] there is no record of how such communication was done but flags would have been the ...
The most popular navigational text of the late 18th century was The Practical Navigator by John Hamilton Moore of the Royal Navy, first published in 1772.To have exact tables to work from, Bowditch recomputed all of Moore's tables, and rearranged and expanded the work.
The oldest sailing directions, dating back to the middle ages, descended directly from the Greek and Roman periplii: in classical times, in the absence of real nautical charts, navigation was carried out using books that described the coast, not necessarily intended for navigation, but more often consisting of reports of previous voyages, or celebrations of the deeds of leaders or rulers.