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A US Navy crewman signals the letter 'U' using flag semaphore during an underway replenishment exercise (2005). Flag semaphore (from the Ancient Greek σῆμα (sêma) 'sign' and - φέρω (-phero) '-bearer' [1]) is a semaphore system conveying information at a distance by means of visual signals with hand-held flags, rods, disks, paddles, or occasionally bare or gloved hands.
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 ...
"I am taking in or discharging or carrying dangerous goods." (Originally used by the Royal Navy specifically for military explosives.) C Charlie: Azure, a fess gules fimbriated argent "Affirmative." [a] [b] Magnetic bearing: D Delta: Or, a Spanish fess azure "Keep clear of me; I am maneuvering with difficulty." [b] Date E Echo: Per fess azure ...
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 sailor on board a US Navy ship preparing a signal hoist. Prior to 1969, the code was much more extensive, covering a wider range of messages and including a list of five-letter codes for every prominent maritime location in the world. Since 1969, it has been reduced to focus on navigation and safety, including a medical section.
By 1653, the Royal Navy had issued instructions by which an admiral could signal various orders by hoisting flags in various locations on his ship. Modern naval code signalling began with the invention of maritime signal flags in the mid-17th century by the then-Duke of York (subsequently James II of England ) [ 2 ] who was created Lord High ...
While there was certainly a Signalman rating before World War II (the Signalman rating is one of the oldest in the Navy), a specialized Signalman rating was established shortly after the war. Then, Signalmen were identified by the symbol of two crossed semaphore flags on the left sleeve of the uniform, integrated with their rank insignia.
The US Navy's first phonetic spelling alphabet was not used for radio, but was instead used on the deck of ships "in calling out flags to be hoisted in a signal". There were two alternative alphabets used, which were almost completely different from each other, with only the code word "Xray" in common.