The fathom equals exactly 6 feet or 1.8288 meters. It is the traditional marine unit for water depth, used on older nautical charts and in recreational sailing. Modern charts mark depths in metres, but fathoms still appear in maritime literature and older US charts.
Real-world: A "mark twain" reading โ made famous by the Mississippi riverboats โ meant 2 fathoms (3.66 m) of water, the minimum safe depth.
Read full fathom reference โThe yard equals 0.9144 meters exactly, or 3 feet. It is the standard field unit in American football (100-yard field) and British cricket (22-yard pitch). Fabric and textile in Anglo-Saxon countries is still sold by the yard. Historically the yard was said to be the length of King Henry I of England's arm.
Real-world: An NFL football field is 100 yards = 91.44 metres. A cricket pitch is 22 yards = 20.12 metres.
Read full yard reference โ