MacDonald, Alexander Forsyth, 1897-1965 · Port Credit, Ont. : Aviation Service Corporation · leaf 66
e obvious.All long distance flights are flown over great circleroutes. A Great Circle, however, does not cross the Merid-ians it meets at the same angle. For this reason, theheading must be changed at frequent intervals to en-able an aircraft to maintain a Great Circle Route. A RHUMB LINE is a… … Great Circle. Fig. IB. Rhumb Line. 62 From The Ground Dp HEADINGS AND BEARINGS The direction of any point on the surface of the Earthfrom an observer 13 known, if the angle at the observerbetween a Meridian passing through the observer and aGreat Circle joining him to the object is known. This
Airplanes
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