Every sailor needs to know signal flags and Morse code.
Flag semaphore - Wikipedia, the free encyclopedia
Vintage Chart of Semaphore System Alphabet Flags Pennants Communication Symbols
Semaphore flag signalling used back in the 1790's and used in Seafaring and also on the battlefields
1897 Telegraph Communication Antique Print Vintage by Craftissimo
Sailing flags for decoration and learning station. Could easily have paper take home projects.
1940 Signals Flags Pennants Nautical Semaphore System
Great semaphore clipart.