Not sure that’s the most comforting analogy to pick. GPS is maintained and controlled by the US military. They can shut it off, used to secretly make it intentionally inaccurate, have dual-band devices to protect against failures of GPS by using competitors, etc
Perhaps, although I didn't pick the analogy, and even accepting at face value what you're saying: clearly there is justifiably a much higher level of trust in GPS than public health advice, and for good reason: its scope is limited and it's had a much better track record.
