The Tracker is a general purpose satellite tracking program intended for tracking and plotting the positions of many different types of satellites for uses ranging from meteorology, communications, image reception and amateur radio. Screen displays include space views where the satellites are on a world map and Earth views showing satellites against a background of stars. The program can also compute operational prediction data for satellites passing within range of a particular Earth station. eg times of acquisition and loss, maximum elevation and rising and setting azimuths. To plot satellites the Tracker needs to be loaded with Kepler parameters. These are terms that provide a mathematical description of the orbit and are available in standard text format from various sources. Keplers need to be periodically refreshed and for computers with a web connection, Tracker has the ability to download these directly from the internet.