Originally Posted by
paull
I understand all the wrinkles, but assuming constant heading and some assumption about cruise speed, you will actually get a track/position. (Actually 2 in most cases).
If the circles are relatively close together in time, it is flying north (or Sth, depending on the circles), if they are wide apart (or don't change) then it is flying E or W. Anything in between can be worked out with some assumption about cruise speed, possibly even without, I'll have to think about it.
You obviously understand this better than me, 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.
The fact that it has made someone think about it and get even more info from the scenario is good enough.
BTW i assumed constant speed because a) i think on auto pilot and b) references to cruise speed.