Semaphore
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Semaphore is the use of an apparatus to create a visual signal transmitted over distance. A semaphore can be performed with devices including: fire, lights, flags, sunlight, and moving arms. Semaphore
Coastal semaphore using moving arms at Scheveningen, circa 1799
Sailor with signal lamp
Flag alphabet
Heliograph
International maritime signal flags are standarized flags used to communicate with ships. The principal system of flags and associated codes is the International Code of Signals. Various navies have f
Semaphore
…used during underway replenishment at sea and is acceptable for emergency communication in daylight or using lighted wands instead of flags, at night. International maritime signal flags are a system used by ships for communication at sea, each flag representing a specific letter, numeral, or message in the international maritime signal…
USS Blue Ridge (LCC-19) displaying signal flags indicating a pilot aboard, a coded message, and her callsign, "NQHS"
Sailor prepares signal flags for operations at sea
Example of signal flags used as decoration aboard USCGC Eagle
Two sail boats dressed overall with signal flags.