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The Qualcomm 855 chipset supports the latest in GPS, GNSS, which allows for much more accurate location performance. Please see this site for details. Purchasing a "flagship" device like the X1, I feel that this is the sort of thing that should be provided, and can differentiate the X1 from most others (save the Samsung Galaxy and a few other devices).
It appears that this simply needs to be enabled via firmware to allow applications to consume the data. Please consider enabling this feature so we can get the most out of the hardware provided.
Also enable on the Xperia 5