Her Majesty's Yacht Britannia, also known as the Royal Yacht Britannia, is the former royal yacht of the British monarchy. She was in service from 1954 until 1997. She was the 83rd such vessel since King Charles II acceded to the throne in 1660, and is the second royal yacht to bear the name, the first being the racing cutter built for the Prince of Wales in 1893. During her 43-year career, the yacht travelled more than a million nautical miles around the world to more than 600 ports in 135 countries. Now retired from royal service, Britannia is permanently berthed at Ocean Terminal, Leith in Edinburgh, Scotland, where it is a visitor attraction with over 300, 000 visits each year. Construction HMY Britannia was built at the shipyard of John Brown & Co. Ltd in Clydebank, Dunbartonshire. She was launched by Queen Elizabeth II on 16 April 1953, and commissioned on 11 January 1954. The ship was designed with three masts: a 133-foot (41 m) foremast, a 139-foot (42 m) mainmast, and a 118-foot (36 m) mizzenmast. The top aerial on the foremast and the top 20 feet (6.1 m) of the mainmast were hinged to allow the ship to pass under bridges. Britannia was designed to be converted into a hospital ship in time of war, although this capability was never used. In the event of nuclear war, it was intended for the Queen and Prince Philip, Duke of Edinburgh, to take refuge aboard Britannia off the north-west coast of Scotland
