Waving flags for communication
Flags have been used at sea for centuries. They allow ships to identify the country another ship hails from at a glance. On warships, flags...
Codelanguage: dots and dashes
The first optical telegraph messages sent over great distances were transmitted at the end of the eighteenth century. In 1838, the American painter, inventor and professor Samuel Morse (1791-1872) invented the alphabet that would come to be known as Morse code.
Knots and miles for measuring
How far is a nautical mile? Surprisingly, it was not until 1929 that a body of countries agreed in Monaco that the sea mile (officially, the international nautical mile) measures 1,851.8 metres.