Surveying
If the horizontal distance between the staff point and the point of observation is d, then the error due to curvature of earth is proportional to

1/d
d
1/d2
d2

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Surveying
The prismatic compass and surveyor’s compass

both give WCB of a line
give whole circle bearing (WCB) of a line and quadrantal bearing (QB) of a line respectively
both give QB of a line and WCB of a line
both give QB of a line

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