autoflight,
surely, bearing in mind the protected range of a glidepath signal (as pointed out by BlueEagle) the discrepancies are more likely to be due to signal interference at greater ranges than due to earth curvature! How far out are you talking about for earth curvature to become a factor?
PP
ps OZ,
I had a friend who flew a big turbo-prop and it never ceased to amaze me that he said they could maintain some rediculous sounding speed to 4nm before chucking out the prop 'anchors'. Props do have their advantages in some phases of flight!
Last edited by Pilot Pete; 20th Jul 2002 at 18:31.