PRISMATIC COMPASS SURVEY

Basic terms used in compass survey

Introduction to the basic terms used in compass survey.

Instrument and its setting up

Overview of the prismatic compass instrument and how to set it up for surveying.

Bearing of lines

Understanding bearings including Meridian–True, Magnetic, and Arbitrary. Bearing– fore bearing, Back bearing, Whole circle bearing, Quadrantal bearing system and Reduced bearing, Conversion of bearings, finding include dangles from bearings.

Prismatic Compass

Components, construction, and use of the prismatic compass in surveying.

Local attraction

Causes, precautions to be taken to avoid and correction of bearings affected due to local attraction, calculation of included angles.