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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.
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.
Maritime flag signalling, generally flaghoist signalling, is the principal means other than radio by which ships communicate to each other or to shore (distinguished from flags showing nationality, ownership, or (for naval vessels) organizational status).
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 ...
The meanings of the shapes are defined by the International Regulations for Preventing Collisions at Sea (ColRegs). Day shapes from ColRegs Day shapes are black in color and their sizes are determined by the ColRegs; for example, the size of the ball is not less than 0.6 metres (2.0 ft).
The Z flag is a diagonally quartered square consisting of four isosceles triangles with their apexes meeting in the center of the square – a yellow triangle on the top, blue at the fly (right), red on the bottom, black at the hoist (left). It is the only flag in the international maritime flag set to use four colors.
The new symbol was embraced around the world, with notable moments including Baker's record-setting mile-long rainbow flag, carried by 5,000 people along Fifth Avenue in New York City in 1994 to ...
Flag signals can mean any of various methods of using flags or pennants to send signals. Flags may have individual significance as signals, or two or more flags may be manipulated so that their relative positions convey symbols. Flag signals allowed communication at a distance before the invention of radio and are still used especially in ...