Unfortunately, we generally try out our new apps sitting at our desk, on the bus or subway, or in a waiting room. Not places one expects to get good GPS signals. In all likelihood, your phone is very capable of getting a great fix on your position when and where you’d really need it--outdoors. That said, sometimes you want to get the closest address or find out what street you’re on.
How many signals? Signals from at least 4 satellites is good. To determine a location on the surface of the Earth, 3 satellites is enough but isn’t great. A fourth helps your phone trilaterate your altitude which is why you may get a position on Earth before the phone knows your altitude.
More inaccuracy. If your signal bounced off a building or canyon wall and traveled further than expected to get to you, it can throw off the calculations. Being indoors increases the likelihood of getting one of these indirect signals.
As always, please let me know how you do.
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