Surveying
For any star to be a circumpolar star, its

Declination must be 0°
Hour angle must be 180°
Distance from the pole must be less than the latitude of the observer
Declination must be 90°

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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
All listed here
Primary triangles are broken down into secondary triangles of somewhat lesser accuracy

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Surveying
Transit rule of adjusting the consecutive coordinates of a traverse is used where

angular measurements are more accurate than linear measurements
All of these
linear measurements are more accurate than angular measurements
linear and angular measurements of the traverse are of equal accuracy

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