• The Earth provides a large magnetic Field 

 

 

• our Smartphones' have built-in magnetic sensors 

 

 

• Steel structures create magnetic disruptions that are unique

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• track location by detecting the magnetic field distribution inside a building.

 

 

• allows location tracking without extra hardware.

 

 

• It works indoors and outdoors

 

 

• Provides locational data at low cost, high accurate