Admiral of the Fleet : The highest officer under the admiralty of Great-Britain: when he embarks on any expedition, he is distinguished by the union flag at the main-top-mast-head
William Falconer's Dictionary of the Marine, Glossary, Published by South Seas using the Web Academic Resource Publisher, London 1780. (http://threedecks.org/index.php?display_type=glos sary, (Mrtm - Brit) {583}