Gps erroneous information
How can I get my gps location to stay within a block of my actual location?
iPhone 13 Pro, iOS 15
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gps require line of sight with 3 satellites to be accurate
indoors with thick walls block this, move toward a window or go outside
if it can't get a fixture it will fall back on using the location provided to it by the cellular tower it's connected to
or the wifi router if not connected to the cellular network this will always be less accurate
you can read more about it here