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This seems to be a known bug at the moment. Keep an eye on the following thread for the latest updates from fitbit:
https://community.fitbit.com/t5/iOS-App/GPS-not-working-since-IOS11-update/m-p/2205799#M67650
Best AnswerGPS problem is still there. You have to open Fitbit app then double press the home button and swipe up to close the app. Then open the Fitbit app again and then GPS works but this has to be done every time. Not satisfactory and Fitbit show no sign of resolving this issue.
Best Answer