A software update is being pushed out for the Fitbit Charge 4 that adds some very useful new features to the wearable, including improvements to GPS handling, sleep management and how the monochrome display is used.
As per the help document on the Fitbit website, version 1.96.29 of the device software enables dynamic GPS: the tracker will use your phone’s GPS to fix its location, if your phone is close enough, and that should save on battery life (otherwise the Charge 4 will revert to its own GPS sensor).
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https://www.techradar.com/news/the-fitbit-charge-4-is-getting-some-useful-new-features-via-a-software-update
