Semaphore signal flags Optical communication

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a naval signaler transmitting message flag semaphore (2002).


semaphore flags system conveying information @ distance means of visual signals hand-held flags, rods, disks, paddles, or bare or gloved hands. information encoded position of flags, objects or arms; read when in fixed position.


semaphores adopted , used (with hand-held flags replacing mechanical arms of shutter semaphores) in maritime world in 19th century. still used during underway replenishment @ sea , acceptable emergency communication in daylight or, using lighted wands instead of flags, @ night.


the newer flag semaphore system uses 2 short poles square flags, signaler holds in different positions convey letters of alphabet , numbers. transmitter holds 1 pole in each hand, , extends each arm in 1 of 8 possible directions. except in rest position, flags cannot overlap. flags colored differently based on whether signals sent sea or land. @ sea, flags colored red , yellow (the oscar flags), while on land, white , blue (the papa flags). flags not required, make characters more obvious.







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