Next time you’re on a flight, download a GPS speedometer app and launch it right before takeoff. You’ll notice that it’ll accurately measure the plane’s speed up to around 500 MPH, before it suddenly stops giving you a speed readout.
Like the other person said, this is to prevent your average dude building a guided missile using an old phone they have lying around.
It’s a built-in security of the protocol. For accurate speed measurement device would need access to L2 frequencies, which carry encrypted data used for additional corrections, faster calculations, atmospheric conditions, etc. One can certainly get a location tracked through phone, but it’s not solely though GPS, it’s most likely combination of other positioning systems.
Next time you’re on a flight, download a GPS speedometer app and launch it right before takeoff. You’ll notice that it’ll accurately measure the plane’s speed up to around 500 MPH, before it suddenly stops giving you a speed readout.
Like the other person said, this is to prevent your average dude building a guided missile using an old phone they have lying around.
It’s a built-in security of the protocol. For accurate speed measurement device would need access to L2 frequencies, which carry encrypted data used for additional corrections, faster calculations, atmospheric conditions, etc. One can certainly get a location tracked through phone, but it’s not solely though GPS, it’s most likely combination of other positioning systems.