I mean, they can, but they literally have a .gov webpage dedicated to Bill Clinton's 2000 act of ending SA and how it will not be changed. So they could, but they'd be renaging on a promise made to the civilian and commercial public. Which in the current climate is entirely possible.
So yes, a receiver could be altered based on a predetermined hard coding, but I think something like that - Geo based hard coding - would be available knowledge, maybe not widely or publicly, but available knowledge.
"It is not the intent of the U.S. to ever use SA again. To ensure that potential adversaries to do not use GPS, the military is dedicated to the development and deployment of regional denial capabilities in lieu of global degradation through SA"
I mean, they can, but they literally have a .gov webpage dedicated to Bill Clinton's 2000 act of ending SA and how it will not be changed. So they could, but they'd be renaging on a promise made to the civilian and commercial public. Which in the current climate is entirely possible.
So yes, a receiver could be altered based on a predetermined hard coding, but I think something like that - Geo based hard coding - would be available knowledge, maybe not widely or publicly, but available knowledge.