Nautical

Code of Signals - International nautical/marine signal flags geographic.org.
www.geographic.org/flags/code_of_signals_flags.html

International Signal Flags - Graphic word-to-signal converter.
www.sartori.com/nhc/flags/

Maritime Signal Flags - Offers quiz of random phrases with English translations.
www.sideslip.org/flags/

Nautical Flag Translator - Translate your initials into nautical signal flags.
www.wingood.com/flagselect.asp