Your iPhone has a built-in barometer — Here's how to use it

Summary
The iPhone's barometer is easy to overlook, but it's one of several sensors working behind the scenes every day, collecting data most users haven't seen.
Description from Engadget.
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Your iPhone has a built-in barometer — Here's how to use it
The iPhone's barometer is easy to overlook, but it's one of several sensors working behind the scenes every day, collecting data most users haven't seen.
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