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To summarize: 

• Course—intended path of an aircraft over the ground or the direction of a line drawn on a chart representing the intended aircraft path, expressed as the angle measured from a specific reference datum clockwise from 0° through 360° to the line. 

• Heading—direction in which the nose of the aircraft points during flight. 

• Track—actual path made over the ground in flight. (If proper correction has been made for the wind, track and course are identical.) 

• Drift angle—angle between heading and track. 

• WCA—correction applied to the course to establish a heading so that track coincides with course. 

• Airspeed—rate of the aircraft’s progress through the air. 

• GS—rate of the aircraft’s inflight progress over the ground. 

