Morgans wrote:

Seems to me, that is implied.

Doesn't seem implied to me at all. The original postulations involved multiple
aircraft approaching to land at an airport. That is a situation in which several
aircraft are known to be at the same altitude on courses which are more or less
converging. Knowing the location of the applicable VOR will tell you
approximately how close to converging those courses are. It's a *real* stretch
to say the same thing about cruise flight.

George Patterson
Why do men's hearts beat faster, knees get weak, throats become dry,
and they think irrationally when a woman wears leather clothing?
Because she smells like a new truck.