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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.
To avoid having to carry multiple sets of signal flags, the Code uses three "substitute" (or "repeater") flags. These repeat the flag at the indicated position. For instance, to signal MAA ("I request urgent medical advice" the Mike, Alfa, and 2nd substitute flags would be flown, the substitute indicating a repeat of the second character.
The Hershey fonts are a collection of vector fonts developed c. 1967 by Dr. Allen Vincent Hershey at the Naval Weapons Laboratory, [1] [2] [3] originally designed to be rendered using vectors on early cathode ray tube displays. Decomposing curves to connected straight lines allowed Hershey to produce complex typographic designs.
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 ...
Ireland - List of flags of Ireland § Naval service; Japan - List of Japanese flags § Self-Defense Force and Imperial Army/Navy; Latvia - List of Latvian flags § Military flags; Norway - List of Norwegian flags § Flags of the Navy; Poland - List of Polish naval and maritime flags, List of Polish flags § Navy; Russia - List of Russian navy flags
The rank flag or distinguishing flag is the flag worn by a superior officer on their flagship or headquarters (hence the term flagship). The origins of this are from the era before radiotelegraphy and radiotelephony, when orders were given by flag signals. The flag denotes the ship which must be watched for signals designating orders. Such ...
As well as digit flags, the code used "repeat" flags so that only one set of digits was needed; thus the word do, coded as "220", used a "2" flag, a "first repeat" flag here serving as a second 2, and a "0" flag. [12] The end of the message would be indicated by an "end of code" flag (blue over yellow diagonally split). [10] [12]
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