Developer's DescriptionBy Pirate CatsInternational Code of Signals (ICS) flags are commonly used by sailors to communicate with each other for navigation and safety.International Code of Signals (ICS) flags are commonly used by sailors to communicate with each other for navigation and safety.Nautical Flags Helper is an app for memorize flags used by merchant ships, commercial fishing and private yachts.You will learn numerical and alphabetical flags. Each card additionally contains semaphore flags and Morse code. Also you always may take a quiz and see your progress. Enjoy.