Flag alphabet
Ships use the flag alphabet to exchange messages. They do this optically, using signal flags. There are different ways in which this can be done:
- Each flag can represent a letter, all the flags spell out the message
- A flag used alone usually has a special meaning. A boat supporting a diver will show the "A flag"
- Several flags used together can form a code, which can be looked up in a code book both ships have.
- In ship races, flags have different meanings:
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