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For your privacy, the app does not automatically detect your location through the GPS, etc. Instead, the app asks you to tell it only as much information as you want to, such as city, state, postal code, etc. Or don’t tell the app anything about where you are. It will still work. It just won’t provide a very realistic reading.
Interference can throw the various sensors out of sync. The sensors will fix themselves if you keep moving the phone. Rotating the phone left-over-right especially tends to help.
Go to the iPhone’s Settings app and scroll down to Santa. From there, you can select miles or kilometers.