Surveying
The nautical mile is the length of

1 minute of longitude
1 degree of longitude
1 degree of latitude
1 minute of latitude

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Surveying
Contour interval is

Inversely proportional to the scale of the map
Larger for accurate works
Larger if the time available is more
Directly proportional to the flatness of ground

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Surveying
The length of a chain is measured from

outside of one handle to outside of other handle
outside of one handle to inside of other handle
centre of one handle to centre of other handle
inside of one handle to inside of other handle

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