Yeah, I agree that GPS is too easy to jam and should ideally not be used exclusively but if you are flying anything from a newish C172 to a Cessna Citation (or any other non-long haul business jet) it is the reality.

Annoyingly all of these systems have VOR and DME equipment, it would be trivial to have a back up position to well within en-route navigation accuracy limits and certainly close enough to prevent this kind of accident. But regulation and certification requirements being what they are they are no one does it.

In an ideal world we'd have some kind of INS but the ring laser gyros and accelerometers required are stubbornly expensive.

In this case the call was coming from inside the house. Another win for uncle Sam.