How GPS became a human tracking mechanism

Re:How GPS became a human tracking mechanism by imglorp on Wednesday December 28, 2016 @02:13PM (#13272809)

Here's a couple more.

  * Inertial navigation, using gyro and accelerometer to approximate movement since last known position.
  * Pressure sensor can give approximate Z axis (altitude).  This is significant if your X,Y says you're in or near a tall building; combined with the Z, you confirm the building and the floor +/- a few floors.

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