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

Another aspect is that GPS is a one way radio communication. You only need to be able to receive the signal from the satellite, and don’t need to transmit back to it. For the other systems you talked about your device needs to be able to receive and have a powerful enough transmitter to send signals back.