Not many people would volunteer to wear the classic prisoner's anklet that reports their location to a satellite monitoring system regularly. It would be, rightly, considered an invasion of privacy -- something society imposes on convicted criminals who pose a demonstrated threat to innocent people. But millions of people carry cell phones with them everyone and don't give it a second thought.
Perhaps they don't realize that their cell phone is a tracking technology almost as powerful as the monitoring devices used on prisoners. Technology firms in the UK are already marketing this as a "service", one that covers not only where the cell phone is now but where it has been in the past. While those services claim to require consent, the underlying technology does not, and that means governments (and private parties through the court system) will have access to the data with no consent required and most likely no opportunity to contest the release.