This Scratch program displays the player's message (up to 88 characters) in the international flag alphabet. Only letters and numbers are displayed, not punctuation. Controls: Make all the flags larger or smaller by changing the variable manually in the Stage script. You will also need to adjust the spacing between lines and letters. Press <s> to turn the introductory text and music off. Reset using the stop sign and green flag to begin a new message.
Image of "The Signal is to SAVE" from World War II Propaganda Posters-- http://www.nationalww2museum.org/learn/education/for-students/ww2-history/at-a-glance/propaganda-posters.html. Music "Men of the Yorktown" and "Midway March" composed by John Williams, performed by Boston Pops Orchestra, from the movie The Battle of Midway, 1976. The International Code of Maritime Signals substitutes letters for pre-arranged flags. In addition to spelling out messages, there are one- two- and three- flag series to quickly communicate with other ships. Navy and commercial ships also use pre-arranged codes signaled by combinations of flags. For further information, the Wikipedia article can get you started-- https://en.wikipedia.org/wiki/International_Code_of_Signals.
