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International maritime signal flags are various flags used to communicate with ships. The principal system of flags and associated codes is the International Code of Signals . [ 1 ] Various navies have flag systems with additional flags and codes, and other flags are used in special uses, or have historical significance.
Standard chart of "International Flags and Pennants" of the International Code of Signals (also known as "Pub. 102") "The purpose of the International Code of Signals is to provide ways and means of communication in situations related essentially to safety of navigation and persons, especially when language difficulties arise."
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 ...
[5] [6] It was based on the signal books created earlier by Admiral Lord Howe. [7] Popham's code assigned the digits 0 to 9 to ten signal flags, which were used in combination. 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]
A square black flag displayed over the ball may be used as a distress signal. [5] Some of the most common signals (see Day shapes diagram): Navigation status Day shape
A Canadian ship flying 'Bravo Zulu'. According to the U.S. Navy "Navy Data" reference website: "The term BRAVO ZULU originates from the Allied Tactical Publication 1 (ATP 1), [2] an Allied military maritime tactical signals publication, which in the aggregate is For Official Use Only (FOUO), now known in the U.S. Department of Defense as Controlled Unclassified Information (CUI), and can also ...
Naval flags, both Naval jacks and naval ensigns, are a subset of Maritime flags flown by naval forces. There are several lists of naval flags, organised by present or ...
A US Navy crewman signals the letter 'U' using flag semaphore during an underway replenishment exercise (2005). Flag semaphore (from the Ancient Greek σῆμα (sêma) 'sign' and - φέρω (-phero) '-bearer' [1]) is a semaphore system conveying information at a distance by means of visual signals with hand-held flags, rods, disks, paddles, or occasionally bare or gloved hands.
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