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Relative positioning

  • US 8,612,172 B2
  • Filed: 09/19/2006
  • Issued: 12/17/2013
  • Est. Priority Date: 09/19/2006
  • Status: Expired due to Fees
First Claim
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1. A method comprising:

  • requesting, by an apparatus, and receiving, by the apparatus, from a first device information on barometric pressure at said first device;

    converting, by the apparatus, said information on barometric pressure at said first device and information on barometric pressure at a second device into a difference in altitude between said first device and said second device, said first device and said second device being physically unconnected; and

    using, by the apparatus, said difference in altitude between said first device and said second device in determining a position of said first device relative to said second device.

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