DFC, there really is no point reading from your book and telling people there is 'no point in planning to miss a CTR boundary by 1nm based on GPS', when these same people know exactly how accurate GPS is from practical experience.
VORs are only certified to keep you within a certain distance from the centreline, but you can still shoot VOR approaches and expect to land on the runway when you break out 600ft AGL. The GPS accuracy doesn't change along an airway like a VOR receiver does. I think the 5nm you quote has more to do with VOR physics than GPS physics. In fact there is a strong argument for airlines to fly an 1nm offset because GPS are so accurate they will hold you precisely on the centreline.
GPS's are approved for non precision approaches in the States, they will get you to the airport with an accuracy of far greater than the one mile you are telling us there is no point to rely on.
I'd also ask how you came up with 'less than 1%', you would have to ask several hundred people the question before you get anything statistically quoteble, and I simply don't believe you anyway. Perhaps you should ask light aircraft pilots the question?
Bonglebear, do a search in the private pilot forum. You will find loads of stuff on this site, most of it repeated (as proven by my post above). You will also see the same names pop up
