• ## Whole Circle Bearing and Reduced Bearing

In whole circle bearing (WCB) the bearing of a line at any point is measured with respect to a meridian. Its value varies from zero to 360Â°, increasing in clockwise direction. Zero is north direction, 90Â° is east, Â 180Â° is south and 270Â° is west (Ref. Fig. 13.2). This type of bearing is used in prismatic compass.

In reduced bearing (RB) system, bearings are measured from north or south direction towardsÂ east or west. Hence, angles are from 0 to 90Â° as shown in Fig. 13.3. This system of measuring bearingsÂ is used in Surveyorâs compass and it is also known as Quadrantal Bearing (QB). The bearing measuredÂ is designated with letter N or S in the beginning to indicate whether it is from north or south. The letterÂ E or W written after the angle indicates whether the bearing read is towards east or west, respectively.
The conversion of the bearing from one system to the other system can be easily carried out byÂ drawing a sketch to indicate WCB or RB as shown in Fig. 13.4. It may be observed that conversion tableÂ is as given below:

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### 5 Comments to Whole Circle Bearing and Reduced Bearing

• vijay gupta says:

sir
what is length of plane and geodetic survey

• Faizullah says:

Thanks a lot for yours help and infromation

• Tayyab Hanif says:

plz tell me about that i want to made an assignment about conversion of whole circle baring to reduce baring

• Ahti Ahtisham says:

For geodetic 150 km and for plan survey length will be 5 to 10 km,