A direction (bearing) in navigation usually is referred to a standard North direction as a clockwise angle from that north direction. Generally, we use any of several north reference directions for specific purposes: true north, magnetic north, and grid north. The related bearing directions are referred to as true bearing, magnetic bearing and grid bearing.
So, a true direction (or bearing) is the clockwise angle between the direction of true north (at the location) and the direction in which you have an interest at the time.
Engineering specialist in aircraft performance and weight control.