In article ,
(Ace Pilot) wrote:

I don't know anything about the engineering of runways, but it would
come as a surprise to me that modern methods (laser range finding,
GPS, etc.) couldn't pin down a runway length to within several inches.

Can one _define_ the "start" and the "end" of a runway to within several
inches? (seems to me paving or blacktop would roll off over several
inch range)