Originally Posted by
FlyingStone
What happens when GPS or FMGC goes haywire? Or is that not the possibility you are taking into account?
That is something i have heard a lot: what happens if my FMCG is gone? Well, then my tuned nav aids are gone as well as the radio nav page is not available anymore and i really have to manually tune stuff on the RMP. Which i have not seen ever done as a routine departure/arrival preparation. I have seen a loss of gps primary, but never GPS causing a nav solution to be wrong. Now, we do know that spoofing exist, but so far it has only been proving using ships as far as i am aware, not aircraft where the range of the required spoofing signal might be an issue much faster.