This Company Uses Earth’s Magnetic Field To See Inside Buildings

This is just brilliant and at the same time scary…

But I wonder… How accurate can it be? For sure it must depend on the quality of the sensor and it’s proper calibration. My Note3 is pure crap with the magnetic sensor, it’s always off and every time you have to reboot the phone you have to “calibrate it” by waving the phone frantically like an idiot…

http://gizmodo.com/this-company-uses-earths-magnetic-field-to-see-inside-b-1579139480

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