Why does GPS work when underground and under big buildings but radio signals, Wi-Fi, and cell phone signals struggle?
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GPS doesn’t. I have an old mid 90’s GPS and it absolutely will not work if you aren’t standing in a field. It’ll continue to work if you go into heavy woods but it won’t like it and likely will lose connection to several satellites. Modern GPS works differently. Sure, the satellites are the very same ones (usually, there are newer ones up there now but the old ones work just fine). Your phone uses the term location services because it doesn’t rely on solely on GPS. It can base your location on where cell towers are, sometimes use data from other nearby phones (I think Apple does this) or it can make an educated guess. Using the accelerometers in your phone and the compass it can tell where you are going and how fast and keep your location accurate enough until you reconnect to the satellites.
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