In mathematics, a bearing is defined as an angle measured clockwise from north. Bearings are usually written as a three-figure bearing, where the angle is always relative to north and therefore provides a consistent measurement of direction. Bearings are important for navigation in 2-dimensions such as when using maps, and are used by sailors, pilots, hikers, and the military.

To calculate a bearing, one must find the angle clockwise from north. Start by drawing a vertical line representing north at the first location. Draw a line connecting the start location to the end location. Measure the clockwise angle between the north line and this line. For example, the bearing from A to B is 100°, which is the angle from north clockwise to B. The bearing from B to A is 280°, which is the angle from north clockwise to A.

Bearings are also used in trigonometry, where they are relevant for parallel lines, scale drawing, and calculating angles. Bearings are measured in degrees, and all bearings must be measured starting from north and turning clockwise.