True Course: The angle between the longitudinal axis of an aeroplane and a true meridian.
Compass course. A true course corrected for variation and deviation errors.
Related Definitions from Aviation Glossary
Full Throttle Height
Live Black Box
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Hung Start - Aircraft Engine
Military Operations Area (MOA) ...
Actual IFR GPS requires proficiency of the highest order ---GPS use magnetic course adjusted from true course to give great circle track
Distance from station affects the sensitivity of the course deviation needle in VOR or LOC ...
Compass course. A true course corrected for variation and deviation errors.
Compass locator. A low-power, low- or medium-frequency (L/MF) radio beacon installed at the site of the outer or middle marker of an ILS.
[edit] Determining the true course of a vessel
Heading (2) is the direction the vessel, aircraft or vehicle is truly "pointing towards" (the heading of the ship shown in the image is 058°).
Measure the true course per leg
Select acceptable checkpoints, every 10 NM or 10 min
Note radio navigation aids along the route to verify position and checkpoints (VOR, NDB)
Measure total route distance ...
COMPASS COURSE - A bearing as indicated by the horizontal angle between the compass needle and the centerline of the aircraft. A Compass Course is equal to a True Course ± variation and deviation; also equal to a Magnetic Course ± deviation.
 See also: Course, Plane, Force, Speed, Aviation
  
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