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   What is  Compass    In surveying, a compass is an essential tool used to determine directions. It consists of a magnetic needle that aligns with the Earth's magnetic field, indicating the direction of magnetic north. Surveyors use compasses to establish bearings, which are angles measured clockwise from a reference direction, typically north. By aligning the compass needle with north, surveyors can measure angles accurately and determine the orientation of lines, boundaries, and features on a map or in the field. This information is crucial for creating accurate maps, conducting land surveys, and navigating terrain, making the compass a fundamental instrument in the field of surveying.  Type of compass  1) surveyor Compass  2) prismatic compass  3) truff compass  1) surveyor Compass Surveyor Compass is an old instrument for measuring directions.  It is a circular box of brass 125 mm in diameter the periphery of which has two vane...