Originally Posted by
mad_jock
But there is no calibration of the information.
You have no way of knowing if its correct or not.
???
which information?
the 'tunnel' is either going to be generated from an LPV Or VNAV representation from the GPS, or I believe from the ILS data. Either way this is going to be 'right' to well below Cat I DH.
I accept there may be a risk that for some airport the runway placement may be in error (certainly with regard to trying a blind landing). And is, as far as I can see, the main risk with SV.