Surveying
Check lines (or proof lines) in Chain Surveying, are essentially required

To increase the out-turn
To indicate the accuracy of the survey work
To plot the chain lines
To plot the offsets

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Surveying
For a line AB

none is correct
the forebearing of AB and back bearing of BA differ by 180°
both (A) and (B) are correct
the forebearing of AB and back bearing of AB differ by 180°

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Surveying
For mapping any country

Secondary triangles are further broken into third and fourth order triangles, the points of which are used for detail surveys
Geodetic triangulation of greatest possible sides and accuracy is carried out
Primary triangles are broken down into secondary triangles of somewhat lesser accuracy
All listed here

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