Changes

In the reign of Queen [[Elizabeth I]] of [[England]], the mile was decreed by a Statute of Parliament to be 5280 feet long or 320 rods and is therefore known as a '''statute mile'''.<ref>http://www.unc.edu/~rowlett/units/custom.html</ref>  This measure is still used mainly in the USA and UK.

In the reign of Queen [[Elizabeth I]] of [[England]], the mile was decreed by a Statute of Parliament to be 5280 feet long or 320 rods and is therefore known as a '''statute mile'''.<ref>http://www.unc.edu/~rowlett/units/custom.html</ref>  This measure is still used mainly in the USA and UK.

The '''international statute mile''' was defined in 1960 as being 1760 yards (or 1,609.344 metres) long with one inch (1/36 yard) being set at exactly 25.4 millimetres.  This means that 1 metre is  39.3700787 inches.

The '''international statute mile''' was defined in 1960 as being 1760 yards (or 1,609.344 metres<ref>http://ts.nist.gov/WeightsAndMeasures/Publications/appxc.cfm#4b</ref>) long with one inch (1/36 yard) being set at exactly 25.4 millimetres.  This means that 1 metre is  39.3700787 inches.

The '''US survey mile''' is defined in reverse, with 1 metre being equal to 39.37 inches exactly.  The US survey mile is therefore 3 mm longer than the international mile at 1,609.347 metres. This unit of measurement is used by US Public Land Survey System.

The '''US survey mile''' is defined in reverse, with 1 metre being equal to 39.37 inches exactly.  The US survey mile is therefore 3 mm longer than the international mile at 1,609.347 metres<ref>http://ts.nist.gov/WeightsAndMeasures/Publications/appxc.cfm#footnote11</ref>). This unit of measurement is used by US Public Land Survey System.

==Nautical Mile==

==Nautical Mile==