Thanks Eagle732. This is great news as I know Morse Code and Semaphore, but I was afraid I was going to have to learn a whole new code from 1865. Do you have a link to a source?
WIgwag is a method of sending Morse Code by the use of a single flag. Basically you move the flag from the upright (12 o'clock) position down either left or right and back up to 12 o'clock again. A wave to the signaler's right is a dot and one to the left is a dash. A series of waves, say three to the right would mean three dots or the letter "S".
(This message has been edited by Eagle732)