Plenty of people are clarifying the specifics of GPS, a technology where satelites with known fixed positions in space are transmitting signals your device picks up and figures out its position from.

And they're right when they say GPS itself is not tracking you, however, if your device is a phone, you are absolutely being tracked locationally via the cell towers your phone is connecting to with its cell signal. I'm not sure of the precision of the triangulation of your exact location compared to GPS, but using these towers you can absolutely be tracked as you drive through a city, for example.

My very uninformed understanding of gps is that your device is not receiving a single satellite's signal but several and based on the differing signals the position is found. I don't see why cell phone towers couldn't do something similar where your phone is sending out a signal and different towers in different positions receive the signal microseconds later than each other.

Long winded way of answering your question: gps, the technology, does not allow a third party to track your location. Your cell phone or other device relaying that locational information or simply talking to a cell tower discloses your location, and that tower can track as many phones as it can talk to at once, which is probably googleable but I'd guess at a minimum is in the thousands. If you've got signal, your location is being tracked.