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The International Code of Signals (INTERCO) is an international system of signals and codes for use by vessels to communicate important messages regarding safety of navigation and related matters. Signals can be sent by flaghoist , signal lamp ("blinker"), flag semaphore , radiotelegraphy, and radiotelephony.
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.
A ship's message had to be approved by the officer of the watch, and his system was augmented and changed in various ways over the following century. In 1790, Admiral Lord Howe issued a new signal book for a numerary system, using numeral flags to signal a number; the number indicated the message, not the mast from which the flags flew.
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 ...
Half-mast refers to flags flown on ships, while half-staff is used for flags flown on land, at least in the U.S. In Canada and Britain, even flags flown on land are referred to being at half-mast ...
Maritime flag signalling has a long history, especially prior to the advent of radio, and remains the preferred means of signaling in many situations. In naval flag signalling, additional flags and an expanded list of signals are used for identification and commands, as well as the mercantile uses. Many navies have their own proprietary or ...
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1.2 International maritime signal flags. 1.3 International Code of Signals. 1.4 Maritime flag signalling. 1.5 Naval flag signalling. 1.6 Flaghoist signalling.
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