You will need to brush up on your semaphore to find ten words related to signalling hidden here. To make it a little easier all the words go forwards, backwards, up or down; none of them are diagonal. They are also listed below in plain text to give you a starting point. Have fun!
SEMAPHORE, MORSE CODE, SIGN LANGUAGE, FLAGS, BUZZER, LANTERN, HANDKERCHIEF, TORCH, ROCKET, ARMS