Surveying
A Nautical mile is

One minute arc of the longitude
One minute arc of the great circle passing through two points
All of these
1855.109 m

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Surveying
A ’level line’ is a

line passing through the center of cross hairs and the center of eye piece
horizontal line
line passing through the objective lens and the eye-piece of a dumpy or tilting level
line parallel to the mean spheriodal surface of earth

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