What would it take to attack or disrupt the GPS system? In other words, how feasible or likely is it for the GPS system and its network of satellites to be disrupted across a large area such as an entire state or country?
I understand that GPS jamming might be possible from the ground, but I suspect it would be quite localized and apparently newer devices are more resilient to this.
If conflict was to arise between two countries, what is stopping the country that controls some of the GPS satellites from blacking out or jamming an entire region. And perhaps more of a political question – would the effort required actually pay off in any significant advantage or bargaining power?