The difference is in that, while CCTV cameras are usually visible and obvious (many areas even have signs indicating as such), most people are unaware they are

The difference is in that, while CCTV cameras are usually visible and obvious (many areas even have signs indicating as such), most people are unaware they are being tracked in the manner described in the article. CCTV and GPS "fencing" would be comparable if Google were to issue statements clarifying that your location is being tracked and recorded, and may be surrendered to the police without your knowledge.