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An example is the Popham numeric code used at the Battle of Trafalgar. In yacht racing and dinghy racing, flags have other meanings; for example, the P flag is used as the "preparatory" flag to indicate an imminent start, and the S flag means "shortened course" (for more details see Race signals). Sailor prepares signal flags for operations at sea
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.
[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 designator flag is used to indicate if a flaghoist signal is meant to be interpreted as an ICS signal or as a naval signal. The U.S. Navy uses a set of 68 flags, including flags for each letter of the alphabet and each numeral to convey messages of tactical or administrative nature. [2] [better source needed]
A full list of available parameters can be found on Wikimedia Commons at Commons:Category:International Code of Signals. For example, Image:ICS Bravo.svg is used when the name parameter is specified as Bravo. size This parameter is optional, and is used to specify the maximum width and/or height of the flag image.
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 ...
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International signal flag for the letter "U". Created by Denelson83. {{GPL}} File usage. More than 100 pages use this file. The following list shows the first 100 ...