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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. [2]
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.
In this code, alphabet letters were equated with three positions of a single flag, disk, or light. The flags measured two, four, or six feet (60, 120 or 180 cm) square and were generally either red or black banners with white square centers or white banners with red square centers. [7]
The code numbers typically would have been hoisted on the mizzenmast, one after another, preceded by the "telegraphic flag" (a red over white diagonally-split flag) [10] to show that the subsequent signals would employ the Popham code. [11] As well as digit flags, the code used "repeat" flags so that only one set of digits was needed; thus the ...
Download QR code; Print/export Download as PDF; Printable version; ... International maritime signal flags; J. Jack (flag) Japanese Navy Signal Flags;
India - List of Indian flags § Navy; 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; Lithuania - List of Lithuanian flags § Military flags; Norway - List of Norwegian flags § Flags of the Navy; Poland - List of ...
But they retain additional flags for naval usage (such as related to maneuvering or status), and use their own codes. E.g., in the ICS the single flag Mike means the vessel is stopped; in the U. S. Navy it means the duty medical officer is on board. Flaghoist was the only way ships could signal prior to the advent of radio and blinking light ...
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 ...