Australian National Botanic Gardens
International Marine Signal Flags
Learn about the Semaphore Flag Signalling System, the Semaphore Alphabet, the Alphabet flags and Numeric Pennants used by ships at sea.
Other
Canadian Government: Department of Defence: Canadian Navy: Operation Stealth Comm
Semaphore Flag signals and Morse Code are explained here. These are still part of the training in the Canadian Navy despite all the technology available today.