20 APRIL, 2019 - MVSOFEA DECK LOG - N AND D NAVY SEMAPHORE
Been revisiting the memory closets for a refresh on Radio waves.... our spate of WiFi problems has me redesigning a fix, during this recall, I re-ventured into Radar, Sonar, and Silent running . . . or no radio contact.
Often it is important to keep communications between vessels off the airwaves, stealth or fishing fleet sightings and movements do not like to be announced and shared, in these cases usually flags or lights are used. I stumbled over this interesting old factoid buried in the files and thought you might enjoy it.
In naval semaphore codes, the letter "N" is represented by a person holding two flags, with arms stretched down at a 45-degree angle. The letter "D" is represented by a person holding two flags, with one arm straight up and the other down.
Naval and Maritime silent signals are conveyed by semaphore or visual communications, like Aldis lamps using morse code, or by hand flags or maritime flags hoisted that use letters and numbers plus a color coded system of communication.
Most people believe other origins about this Hippie culture symbol, but it, in reality, has maritime origins.