Recent iPhones have the hardware necessary to receive these signals, so it’s just up to Apple to add this feature.
The GPS system was created and is operated by the U.S. military. There’s also GLONASS, a Russian equivalent. iPhones use both of these but the result is accuracy to perhaps 15 feet.
That’s why your navigation software sometimes won’t notice if you take a highway exit. Or the icon for your car might jump around when you’re stopped at an intersection.
Read more at cultofmac.com