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Because of the FCC mandated E911 program which required cell phone manufacturers to integrate GPS receivers in their cell phone units, cell phone manufacturers today have made it a standard to have GPS navigation as one of their cell phones' major attractions. GPS-enabled cell phones allow you to view and listen to turn-by-turn directions provided by the cellular provider. Cell phones with GPS navigation features are usually loaded with GPS chips that support A-GPS (or Assisted GPS). However, to use the A-GPS feature, cell phone users must subscribe to their cellular providers GPS-services bundle.
Equipped with a cell phone with the A-GPS feature and subscribed to a cellular provider's GPS navigation services, users can receive driving directions on the their cell phones. These driving directions are fully automated and calculated, so much so that when you miss a turn, the driving directions will adjust accordingly and give you new directions to use to get to where you are heading.
*Example of a cell phone with navigation feature - Nokia N95