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

We use the term “GPS” as a shorthand for “Location Services.” It’s actually one of several means used to determine your location.

Seeing WiFi that is at a known location, cellular triangulation, etc. all augment that ability to show your location. (I don’t know all the ways). In some cars, it will use the speed of the wheels and the turning of the steering wheel to improve the estimate of your location. The system can also fix up inaccuracies by assuming you are still on the freeway when you go into a tunnel.