Because of irregularities in the topography, such as hills and valleys, and obstuctions such as trees and buildings, it may be impossible to see directly from one point to another. In practice these points may be joined by a series of straight lines.

The distances of these lines and the angles between them are measured. This is called a traverse.

In the above figure we can compute the bearing of each line in the traverse as a function of the back bearing of the previous line and the clockwise angle between the two lines.

The animation shows the calculation of the traverse bearings for B®C and C®D.

Can you calculate the travese bearings for D®E and E®F?
!check:
last bearing = first bearing + å angles - (n* 180°)
< n = number of angles >