this post was submitted on 29 Sep 2024
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[Migrated, see pinned post] Casual Conversation

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[–] [email protected] 1 points 9 months ago* (last edited 9 months ago) (1 children)

They don't. There's typically a compass in phones that provides information useful in determining direction.

https://en.wikipedia.org/wiki/Magnetometer

Mobile phones

Many smartphones contain miniaturized microelectromechanical systems (MEMS) magnetometers which are used to detect magnetic field strength and are used as compasses. The iPhone 3GS has a magnetometer, a magnetoresistive permalloy sensor, the AN-203 produced by Honeywell. In 2009, the price of three-axis magnetometers dipped below US$1 per device and dropped rapidly. The use of a three-axis device means that it is not sensitive to the way it is held in orientation or elevation. Hall effect devices are also popular.

[–] [email protected] 1 points 9 months ago

Oh interesting. I guess it makes sense. Much simpler solution with high accuracy.