Space Wave Propagation RNAV

A few niche questions here, but one that rely on a simple realisation: radio waves will travel quickest between two points via the shortest distance possible (as their speed is constant.) As you may know from GNav, the shortest distance between two points on the surface of the earth is a great circle. Therefore, if you are flying towards or away from a beacon, you are following a great circle track.

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What path do space waves follow around the earth?
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