A direction is an angle measured from the north or south meridian.
A direction can be formatted as either a quadrant bearing or whole circle bearing and must be defined from an existing control point to another point (either a false point or another control point).
A quadrant bearing is less than 90 degrees (IP/2 radians or 100 grads), and is measured clockwise in the NE quadrant, counter-clockwise in the SE quadrant, clockwise in the SW quadrant, and counter-clockwise in the NW quadrant.
A whole circle bearing is measured clockwise from either the north or south meridian and is always less than or equal to 2PI.
