Figure 16-14.  Aircraft flight path resulting from its airspeed and direction and the wind speed and direction.  Figure 16-15.  Effects of wind drift on maintaining desired course.  Figure 16-16.  Relationship between true, magnetic, and compass  headings for a particular instance.  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.  16-10  Airspeed effect (1 hour)  20 knots Distance covered over ground (1 hour)  Heading  Wind  Track  Drift angle  Desired course  Heading  TN  MN $_{CN }$ T H - 0 8 °  M H ­ 0 7 8 °  C H - 0 7 4 °  VAR 10° E  DEV 4° 