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The generic answer you can find at Apple support website About location precision or accuracy Depending on your device and available services, Location Services uses a combination of cellular, Wi-Fi, Bluetooth, and GPS to determine your location. If you're not within a clear line of sight to GPS satellites, your device can determine your location ...


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It's the same accuracy as the GPS accuracy of the device. If the GPS on the iPhone can't obtain a good signal, it may use Wi-Fi triangulation which will reduce the accuracy. GPS accuracy may be decreased depending on the phone's environment (i.e. a tunnel would not have great GPS, but standing in an open field would).


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I think I found the answer. Although Find iPhone app doesn't give any clue, this feature on www.icloud.com does explain it: "The location of this Mac won't be updated because it has been erased.". Looks like the behaviour is part of the product design, rationale behind the design is unclear though.



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