Having worked on part of the E911 systems, any 911 call in an area that supports the 3rd level of E911 would automatically request and receive the GPS data. 8 M

Having worked on part of the E911 systems, any 911 call in an area that supports the 3rd level of E911 would automatically request and receive the GPS data. 8 Million requests is not hard to believe or surprising, as they have 48 million customers (according to wikipedia, which should be close enough to accurate). Also remember that if your cell phone is on, your location can be pinpointed with a high degree of accuracy without any GPS data. Look up TruePosition, LLC if you have any doubts.