Unit 
Abbreviation 
Description 
UK Nautical Miles conversion 
n.m. (UK) 
Nautical miles measure distance. 1 nautical mile is the angular distance of 1 minute of arc on the earth's surface. As these differ slightly (6108' at pole c.f. 6046' at equator) 6080 was adopted (this being it's approximate value in the English Channel). The International nautical mile is 1852 metres, so is very slightly different from the UK nautical mile.

Miles conversion 
mi. 
a unit of length equal to 1760 yards 
Furlongs conversion 
furlong 
a unit of length equal to 220 yards still used widley in horse racing 
Chains conversion 
chain 
Unit of length equal to 66 feet, used especially in the U.S. public land surveys. The original measuring instrument (Gunter's chain) was literally a chain consisting of 100 iron links, each 7.92 inches long. Steelribbon tapes began to supersede chains around 1900, but surveying tapes are often still called "chains" and measuring with a tape is often called "chaining". The chain is a convenient unit in cadastral surveys because 10 square chains equal 1 acre. 
Yards conversion 
yrd 
a unit of length equal to 3 feet; defined as 91.44 centimeters; originally taken to be the average length of a stride 
Feet conversion 
ft 
a linear unit of length equal to 12 inches or a third of a yard 
Inches conversion 
in 
a unit of length equal to one twelfth of a foot 
US Leagues conversion 
us leaguge 
A unit of distance equal to 3.0 statute miles (4.8 kilometers). Note that there also Nautical Leagues, UK Leagues and UK Nautical Leagues which all differ. 
Nautical Leagues conversion 
usleagues 
A nautical league was 6,080 yards  or three nautical miles (each league being 6,080 feet).
Note that there also US Leagues, UK Leagues and UK Nautical Leagues which all differ. 
Microinches conversion 
micro in 
One thousand micro inches make up an inch. 
US Nautical Miles conversion 
n.m. (US) 
A unit of length used in marine navigation that is equal to a minute of arc of a great circle on a sphere. One international nautical mile is equivalent to 1,852 meters or 1.151 statue miles. Please not that this is different to a UK Nautical mile. 
Nautical Miles conversion 
n.m. 
A unit of length used in marine navigation that is equal to a minute of arc of a great circle on a sphere. One international nautical mile is equivalent to 1,852 meters or 1.151 statue miles. Please not that this is different to a UK Nautical mile. 
UK Leagues conversion 
uk leagues 
Note that UK leagues differ from Nautical Leagues, UK Nautical Leagues and US Leagues. 
UK Nautical Leagues conversion 
uk nautical leagues 
Note that UK leagues differ from Nautical Leagues, UK Leagues and US Leagues. 