20 ?????? 11. 2. . . . . . . . 20 ?????? 11. 3. In order to start, we will look at the definition of some terms specific to the determination of direction.Angle measurement is a fundamental part of surveying field observations, as the combination of a direction and a distance gives a polar vector to a point and hence a unique location of that point in space. The instruments that have been developed to facilitate angle (or direction) measurement are the magnetic compass, the sextant and the the9462
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