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Implementing geo-fencing on mobile devices

  • US 6,721,652 B1
  • Filed: 11/22/2002
  • Issued: 04/13/2004
  • Est. Priority Date: 11/22/2002
  • Status: Expired due to Fees
First Claim
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1. A method for monitoring a location of a vehicle, the method comprising:

  • selecting a boundary within a coordinate system, the boundary including at least one straight edge;

    determining an angle between a selected straight edge of the boundary and an axis of the coordinate system;

    rotating the boundary by the angle such that the selected straight edge of the rotated boundary is parallel to the axis of the coordinate system;

    identifying a set of coordinates associated with a particular location of a monitored device;

    rotating the identified set of coordinates by the angle; and

    comparing the rotated set of coordinates to the rotated boundary to determine a location of the monitored device with respect to the selected boundary.

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