Originally Posted by
oldoberon
all I could see would be a constant spacing (assuming constant cruise speed) equals a constant hdg/trk but thought it would /could be anyone one of miilions of tangents with respect to the circle or arc of it.
I may misunderstand this but if there was constant spacing (between rings?) then it would indicate flight along a radial from the nadir.
Any other angle would eventually result in flight on the tangent or for a short time effectively along the ring.