Fathom - British Fathom

British Fathom

The British Admiralty defined a fathom to be a thousandth of an imperial nautical mile (which was 6080 ft) or 6.08 feet (1.85 m). In practice the "warship fathom" of exactly 6 feet (1.8 m) was used in Britain and the United States. No conflict in the real world existed as depths on Imperial nautical charts were indicated in feet if less than 30 feet (9.1 m) and in fathoms for depths above that. Until the 19th century in England, the length of the fathom was more variable: from 5½ feet on merchant vessels to either 5 feet (1.5 m) or 7 feet (2.1 m) on fishing vessels (from 1.7 to 1.5 or 2.1 m).

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