The global positioning system (GPS) is rapidly becoming part of our daily lives. Satellite tracking is being used in many applications, from navigating a car journey to making calculations in land surveys. In this article I show how psychologists can begin to use this technology as a means of studying human spatial behaviour. Whereas most experiments tend to take place in laboratory environments, GPS allows us to test in much larger open spaces, giving us a better picture of realworld behaviour. I use two studies from my own laboratory as examples of this technology in action.