Geographical mile longitude at the equator is thus exactly 60 geographical miles. It was closely related to the nautical mile, which was originally determined as 1 minute of arc along a great circle of the Earth, but is nowadays defined as exactly 1852 metres. The US National Institute of Standards and Technology (NIST) notes that: "The international nautical mile of 1 852 meters (6 076.115 49...feet) was adopted effective July 1, 1954, for use in the United States. The value formerly used in the United States was 6 080.20 feet = 1 nautical (geographical or sea) mile." (6080.2 feet is 1853.24496 meters.)
Icelandic units of measurement Icelandic units of measurement A number of units of measurement were used in Iceland to measure length, mass, area, capacity, etc. Since 1907, metric system has been compulsory in Iceland. A number of units were used and these units were analogues to Danish. A number of units were used in Iceland to measure length. One fet was equal to 0.31385 m and one sjómíla was equal to 1855 m, as they were defined by their metric equivalents. Some other units are given below: 1 lína = 1/144 fet 1 þumlungur = 1/12 fet 1 alin = 2 fet 1 faðmur