I found this a very interesting way of communication and I never knew how old it was. This technique started in the late 1600s with the military but it is now used at the beach! Life guards use semaphore flags to communicate with each other in an emergency or just to talk. Here are the links I found that are helpful.
http://www.anbg.gov.au/flags/semaphore.html
http://flagexpressions.wordpress.com/2010/03/23/history-behind-semaphore-flags/
I see the flags all the time at the beach in Cape May, NJ. The green flag represents all is okay, red means danger, or rough surf and black I think means no swimming, or exit the ocean ASAP.
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