Tension Software (http://www.tensionsoftware.com) has revved International Space Station, Mac OS X (10.8 or higher) software that lets you see the exact position of the ISS over the Earth, to version 1.2.
The route path is visualized over the map to evaluate if the station is coming near your position (when meteorological and light condition are adequate you can see it without any instruments). The interactive map (OpenMap) allows 11 level of zoom. The future route of the ISS over the Earth can be displayed up to the next eight hours.
International Space Station 1.2 sports an extended orbit track prevision (from one to eight hours), better internal management of NASA orbit data, and more. It costs US$2.99 and is available at the Mac App Store.