How GPS became a human tracking mechanism
It&#x27;s worth pointing out that modern phones have at least a half dozen other means to determine your location. Not all methods require the phone to participate. Here&#x27;s a few off the top.<p><pre><code>  * CGI&#x2F;CGI-TA&#x2F;UTDOA via the cell network
  * bluetooth discovery
  * wifi AP&#x27;s
  * audio via both mic and speaker, possibly ultrasonic: listen and emit to other devices in environment
  * NFC
  * magnetic field
</code></pre>
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