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.)
Marla (unit) Marla (unit) A marla is a unit of area used in the Indian subcontinent. The marla is a traditional unit of area that is used in India, Pakistan and Bangladesh. The marla was standardized under British rule to be equal to the square rod, or 272.25 square feet, 30.25 square yards, or 25.2929 square metres. As such, it was exactly one 160th of an acre. The definition of marla varies between India and Pakistan. In India, the unit was standardized to 25 square yards. Its use in India is in decline, with the guz, square meter, acre and hectare being