In civil engineering surveying, bearing is very important to get the direction of a survey line. The whole circle bearing (W.C.B) is a common notation system of bearings. The definition of the whole circle bearing along with the measuring formula and example is discussed below.

### What is Whole Circle Bearing (W.C.B)?

The horizontal angle made by a line with the magnetic north in the clockwise direction is the **whole circle bearing** of the line. This system is also known as the **azimuthal system**. In this system, only the north direction is used as reference meridian.

#### Whole Circle Bearing Formula

In whole circle bearing, the value of the bearing varies from 0° to 360°. Just measure the angle between true north line to the survey line to find the WCB. Don't forget to measure the clockwise angle in determining the whole circle bearing.

If a survey line falls in the first quadrant, its WCB varies from 0° to 90°. Similarly, in the second quadrant, WCB value varies from 90° to 180°; in the third quadrant, WCB value varies from 180° to 270°; in the fourth quadrant, WCB value varies from 270° to 360°.

#### Whole Circle Bearing Example

To understand the whole circle bearing measurement clearly, please carefully observe the following image illustrations.

In the above images, the vertical line N is indicating the north line. In Fig 1, line X is in the first quadrant. It is at an angle of 46° with the north line in the clockwise direction. Therefore, whole circle bearing (W.C.B) of line X is 46°.

On the other hand, the line Y in Fig 2, is making 226° angle with the north line in the clockwise direction. So, whole circle bearing (W.C.B) of line Y is 226°.