Flags of the World | National Flags | Yemen

National Flags for sale

Historically, flags were used to impart information at sea. Today, flags continue to be an important communication device and serve as a symbol of national identity. Under the Law of the Sea Convention 1982, every ship must have a nationality and fly a national flag of a state.A courtesy flag is flown by a visiting ship in foreign waters as a token of respect. It is often smallerr than the ship's own national flag, which is the biggest flag on board.