God knows the legalities and checks involved in a BRNav GPS fitted to a commercial airliner. If it lights up and the card is valid it gets used.
And the Mil do publish the times and areas which they are jamming via NOTAM.
To be honest this has already turned into those that swear nothing ever goes wrong and those that don't think they are quite as good as some make out.
Reports can be written at vast expense and people will still say "well i have never had a problem" so its bollocks or doesn't apply to me.
I am quite sure in 50 years time we will be having a similar debate about panel mounted INS systems in light aircraft.
And as the report points out the current set of hardware in orbit is rapidly reaching its sell by date. And who knows what the next system will bring. Considering the cost involved I wouldn't mind betting some where along the line users will be getting charged a liscense fee to use it. And the americans don't even have a viable launch system at the moment so any progam to undate the hardware is on hold.
MJ