signal). Notes Sources . . . . . . . . . External links Flags of the World Comprehensive flag information. International Code of Signals For Visual, Sound and Radio Communications United States Edition, 1969 (Revised 2003) John Savard's flag page. Collection of different flag systems. Flag Signalling at Sea Nice article by Captain Barrie Kent, Royal Navy. Signal Corps Association 1860 ~ 1865 Flag practices Signal flags