This thread is for Naval/Maritime Signal Flag Reference only. Only credible, verifiable links, or lists of important Naval/Maritime Signal Flag Reference Data should be posted here and discussed. Any that is not, will be deleted. So, here is the critical information. These are links to PDF files for each chapter of the: Manual for International Maritime Signal Codes: Chapter 1 - Signalling Instructions Chapter 2 - General Signal Codes Chapter 3 - Medical Signal Codes Chapter 4 - Distress and Lifesaving Signal Codes To come up with, or decipher flag codes, use the following International Signal Flag Code chart: Most manuevering codes can be found in Chapter 2 of the manual.