Whole Circle Bearing (WCB) | Surveying
In Whole circle bearing (WCB) / Azimuthal system - Bearings are measured clockwise from north of reference meridian
Bearing system is of two types - Whole circle bearing and reduced bearing. First let us understand what is meant by bearing and meridians.
Bearing and Meridians
Bearing of line : Direction with respect to a given meridian
Meridian is a fixed reference line
Types of meridian and bearing
True Meridian - Line through true north and south poles, and this remains constant throughout. To find out this line, we need astronomical observations.
Bearing with respect to true meridian is known as true bearing
Magnetic Meridian - Direction indicated by freely suspended magnetic needle, and this magnetic N-S line changes with location and time as they are affected by earth’s magnetism.
Bearing with respect to magnetic meridian is known as magnetic bearing.
Arbitrary Meridian - Well defined reference object like a tower whose position is not going to change, directions are measured with respect to it and they are known as arbitrary bearings
Whole Circle Bearing (WCB) / Azimuthal System
Bearings are measured clockwise from north of reference meridian
It varies from 0 degrees to 360 degrees in the clockwise direction
North will be zero degrees; East will be 90 degrees; South will be 180 degrees and West will be 270 degrees.
Prismatic compass used WCB system
APSEd is an E-learning platform for Civil Engineering by IIT-B Graduates. Get access to all in one place!
Video Lectures & Study Material
Practice Questions & Mock Tests
Exclusive Doubt Support
600+ learners are studying with us. Join them and learn with us for an optimized learning experience.
Hi! I am Aditya, co-founded APSEd with Palaniappan.
Our brain can accumulate and memorize things to a certain extent. Once it is overloaded, some of the facts and formulas you remembered fade away over time.
All this becomes easier once we understand the concept and know how to apply them. This is what we strive to achieve through our courses.
Our Courses + Your Effort = Success in exams!