Oh, not inaccuracies. Just portions of the signal only available to the military. The original intent was to limit accuracy, and now it’s more to counter spoofing, but it’s still there, just upgraded.

It’s not even a secret. Almost all modern cars do as part of remote service packages. It’s what let’s you ask them to unlock your car, do remote start via a phone app, or let’s the police request a remote shutdown of a stolen car.

GPS. The system can be turned off in specific regions (no idea how, it’s classified, but they’ve actually done it so it’s not just a wild notion), and portions of the signal are already encrypted such that they’re only available to the US military. There would be little stopping them from sending altered signals or just turning it off.

Many missile systems, aircraft and fighting vehicles rely on GPS to function as expected.