ISS Detector will tell you when and where to look for the ISS. You get an alarm a few minutes before a pass. You will never miss it. ISS Detector will also check if the weather conditions are right. A clear sky is perfect for spotting. Extensions will enhance the functionality of ISS Detector. With an in-app purchase you can add many famous satellites and amateur radio satellites. See the Starlink satellite trains, Hubble space telescope, rocket bodies, Vanguard 1 and many bright satellites. Available Extensions (in-app purchase): Radio Amateur Satellites: Track dozens of ham and weather satellites. Starlink and Famous Objects: Track Starlink satellite trains, Hubble Space Telescope, rocket bodies, bright satellites and more.