How does GPS work with Google Maps?

So far I always use GPS with Google Maps and do not understand other usage. I find it is very useful for some places where I do not know exactly where it is. I do not really know how it is working. I learnt that the built-in GPS receiver must be working in an opening field - seeing the sky. I find it works in shopping malls, offices, cars, etc. where they cannot see the sky. I got the answers from my friends that A-GPS, cellular network and internet are replaced with GPS to provide the location or search your target if the location cannot see sky. It sounds the GPS is not much useful as more than 50% of actual usage without seeing the sky. Can someone shed some light on to me how my iPhone 4 is working with Google Maps in real life.

It starts by getting a quick rough estimation of your location using nearby cell towers or WiFi hotspots (if WiFi is on). Then it gradually pinpoints your location to a greater degree of accuracy as the various GPS satellites register your location.
Obviously, no GPS system can work if the device cannot "see" the satellites well. That's governed by the laws of physics, which is why the iPhone also uses cell towers and WiFi hotspots to assist.

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