Have you seen the International Space Station? It is visible with the naked eye! ISS Detector will tell you when and where to look for the ISS. You get an alarm a few minutes before a pass and the app provides an Augmented Reality view which helps you spot the station. The Chinese space stations Tiangong 1 and Tiangong 2 are also tracked.
Just use it and you'll love it, and you can certainly impress your friends by saying you know when ISS is coming over. The space station has to be nearby, of course.
