How you can be tracked even with your GPS turned off

This new tracking method comes from researchers at Princeton University. The team was able to create an app to detect information from sensors that it doesn’t need special permission to access. The trick in accurately tracking a person with this method is finding out what kind of activity they’re performing. Whether they’re walking, driving a car, or riding in a train or airplane, it’s pretty easy to figure out when you know what you’re looking for.