AIM
AIM 4-2-10
Directions
The three digits of bearing, course, heading, or wind direction should always be magnetic. The word “true” must be added when it applies.
EXAMPLE-
(Magnetic course) 005 zero zero five (True course) 050 zero five zero true (Magnetic bearing) 360 three six zero (Magnetic heading) 100 heading one zero zero (Wind direction) 220 wind two two zero
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