So what do you suggest we do? Ignore the fact that their tracking does not match up with what we expect? 0.5nm is a long way off track on an RNAV approach (I believe full scale deflection is 0.3NM) and the mountains near Armidale are pretty big. If we are in doubt we have an obligation to do something about it, and quite frankly I'm not willing to just sit there and let something go wrong.