... web portal that Sprint provides law enforcement to conduct automated “pings” to track users. Through the website, authorized agents can type in a mobile phone number and obtain global positioning system (GPS) coordinates of the phone.
They allow network-based location (like signal triangulation), where the location needs to be withing 100 meters for 67 percent of calls and 300 meters for 95 percent of the calls, and handset-based navigation (like GPS) where it has to be within 50 meters for 67% of calls, and within 150 meters for 90% of calls.
Within those guidelines, I think that the phone provider can propose methods to use and have them approved by the FCC. But I guess whether your "precise" location gets tracked depends on the level of precision you're thinking of.
There is a common misconception that GPS is some sort of surveillance system that can return the position of a receiver.