In compass surveying, what is the difference between fore bearing and back bearing of a survey line?

Fore bearing is the angle measured clockwise from magnetic north to the line; back bearing is the angle measured counterclockwise

Fore bearing is the bearing of a line in the forward direction; back bearing is the bearing of the same line in the opposite direction

Fore bearing is always less than 90°, back bearing is always greater than 90°

Fore bearing is the true north bearing; back bearing is the magnetic north bearing

What is the primary purpose of using a compass in surveying?

To measure horizontal distances between points

To determine the magnetic bearings of survey lines

To measure vertical angles for levelling

To calculate the area of a survey plot

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Compare chain surveying with compass surveying in terms of their suitability for rough terrain.

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