I've read I don't know how many posts of people getting gps locks indoors. For one thing, I don't know how that's possible without a view of the satellites, but for another-who cares if it can get a lock indoors or not? So far I can still navigate to the bathroom at all hours of the day (that could become an issue in a few years however)
The GPS signal is just part of the electromagnetic spectrum, so of course it is possible to get a signal indoors. But that seems to be the measurement standard for a working GPS for many.
If I got a great GPS signal indoors, I'd be worried about my A/C or heating bills, because there isn't any insulation in the walls or ceiling to attenuate the signal.
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