<P> 7003185200000000000 ♠ 1852 m is the length of the internationally agreed nautical mile . The US adopted the international definition in 1954, having previously used the US nautical mile (7003185324800000000 ♠ 1853. 248 m). The UK adopted the international nautical mile definition in 1970, having previously used the UK Admiralty nautical mile (7003185318400000000 ♠ 6080 ft or 7003185318400000000 ♠ 1853. 184 m). </P> <Table> Conversions between common units of speed <Tr> <Th> </Th> <Th> m / s </Th> <Th> km / h </Th> <Th> mph </Th> <Th> knot </Th> <Th> ft / s </Th> </Tr> <Tr> <Th> 1 m / s = </Th> <Td> </Td> <Td> 3.6 </Td> <Td> 7000223693600000000 ♠ 2.236 936 </Td> <Td> 7000194384400000000 ♠ 1.943 844 </Td> <Td> 7000328084000000000 ♠ 3.280 840 </Td> </Tr> <Tr> <Th> 1 km / h = </Th> <Td> 6999277778000000000 ♠ 0.277 778 </Td> <Td> </Td> <Td> 6999621371000000000 ♠ 0.621 371 </Td> <Td> 6999539957000000000 ♠ 0.539 957 </Td> <Td> 6999911344000000000 ♠ 0.911 344 </Td> </Tr> <Tr> <Th> 1 mph = </Th> <Td> 6999447040000000000 ♠ 0.447 04 </Td> <Td> 7000160934400000000 ♠ 1.609 344 </Td> <Td> </Td> <Td> 6999868976000000000 ♠ 0.868 976 </Td> <Td> 7000146666700000000 ♠ 1.466 667 </Td> </Tr> <Tr> <Th> 1 knot = </Th> <Td> 6999514444000000000 ♠ 0.514 444 </Td> <Td> 1.852 </Td> <Td> 7000115077900000000 ♠ 1.150 779 </Td> <Td> </Td> <Td> 7000168781000000000 ♠ 1.687 810 </Td> </Tr> <Tr> <Th> 1 ft / s = </Th> <Td> 6999304800000000000 ♠ 0.3048 </Td> <Td> 7000109728000000000 ♠ 1.097 28 </Td> <Td> 6999681818000000000 ♠ 0.681 818 </Td> <Td> 6999592484000000000 ♠ 0.592 484 </Td> <Td> </Td> </Tr> </Table> <Tr> <Th> </Th> <Th> m / s </Th> <Th> km / h </Th> <Th> mph </Th> <Th> knot </Th> <Th> ft / s </Th> </Tr> <Tr> <Th> 1 m / s = </Th> <Td> </Td> <Td> 3.6 </Td> <Td> 7000223693600000000 ♠ 2.236 936 </Td> <Td> 7000194384400000000 ♠ 1.943 844 </Td> <Td> 7000328084000000000 ♠ 3.280 840 </Td> </Tr>

1 knot of current equals how many knots of wind