Why does GPS work when underground and under big buildings but radio signals, Wi-Fi, and cell phone signals struggle?

Question

Why does GPS work when underground and under big buildings but radio signals, Wi-Fi, and cell phone signals struggle?

In: 4773

Answer 1

GPS doesnt actually work any better than wifi or cellphone signals, the only reason you can keep on the road is because the GPS probably has at least the local map saved somewhere on your device so it can refer to it in case of signal drop and the device also has an accelerometer in order to tell how fast youre going. theres also a basic compass to tell the direction too. all in all GPS just has a lot more ability to store data locally than wifi and gps does.