In order to fix up the directions of the survey lines in the compass survey, the horizontal angle between the survey line and a fixed line of reference is measured. This fixed line reference is the magnetic meridian.

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In compass surveying, the direction of survey lines is fixed by measuring the horizontal angle between the survey line and a fixed line of reference, which is indeed the magnetic meridian. The magnetic meridian is an imaginary line that connects the magnetic north and south poles, and it is used as a reference for navigation and surveying purposes.

In Order to Fix Up the Directions of the Survey