Bearings by itself is not that complicated but, as with other sub-topics, when asked as part of complicated question it can get tricky. Bearings are used for navigational purposes and are used to determine the accurate position which is critical in some cases like for planes to avoid collisions.
There are two types of bearings:
As you know there are four sides of compass North (N), South (S), East (E), West (W). This bearing starts from either N or S, has an angle in between and ends with either W or E. Suppose a plane is travelling in the following direction:
This is S55oE i.e. travel south and turn 55o to east.
True bearing is the simpler of the two where it is always measured clockwise from the perspective of North and is written in three digits with a T in the end indicating it is true bearing. So, the two examples above will be drawn and written like this:
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