Naval signalling was briefly considered and he suggested a simple system of thirty-six signal flags of three colours.
United States Naval Academy | Flag of the United States | Naval Postgraduate School | Naval War College | Royal Naval Air Service | Naval Reserve | Office of Naval Research | Chief of Naval Operations | Guantanamo Bay Naval Base | Naval mine | Naval Criminal Investigative Service | naval | Naval fleet | Office of Naval Intelligence | Britannia Royal Naval College | flag | Captain (naval) | Anti-Flag | Naval Station Norfolk | Flag of France | Royal Naval College | Naval | Deepti Naval | Royal Naval Reserve | Naval Air Station Pensacola | Flag of Canada | United States Naval Research Laboratory | naval mine | Women's Royal Naval Service | Naval rating |