Apple has been awarded a patent that describes technology to get emergency responders to the location of the incident. The technology kicks in after a 911 call is originated.
Using satellites, this tech would determine the highest probability of an exact location to notify 911. In the event that can't be determined, subsequent attempts would be made by the phone and the most likely location of the emergency will be sent.
This technology is activated automatically when a 911 call is made so responders can locate the problem when the iPhone owner can't tell them. This could cut down response time when it matters most.