"Don Tuite" wrote in message
...

Under the heading of "Enquiring Minds Want to Know:

In defining an intersection, what's the maximum distance from a VOR
that's allowed?


I guess the simple answer is 135 miles.

The limiting factor is the minimum divergence angle. The minimum divergence
angle (smaller angle of the two crossing radials) is one degree per NM up to
45 miles, beyond 45 miles it's 1/2 degree per NM. Since the mimimum
divergence can't exceed 90 degrees, the furthest you can get is 135 miles.



Does an intersection in a GPS database represent the actual
intersection of VOR radials, or is it defined in LAT/LON terms?
(I.e., can there be two locations for an intersection, depending on
whether you're using VORs or GPS?


There can be many locations for a given fix. For example, a fix identified
by intersecting radials as well as radial/DME from either navaid. The exact
position varies with altitude and which navaid you choose to determinr
position.