Data such as a spacecraft's sub-satellite point, azimuth and elevation headings, Doppler shift, path loss, slant range, orbital altitude, orbital velocity, footprint diameter, orbital phase (mean anomaly), squint angle, eclipse depth, the time and date of the next AOS (or LOS of the current pass), orbit number, and sunlight and visibility information are provided on a real-time basis. PREDICT can also track (or predict the position of) the Sun and Moon. PREDICT also has the ability to control AZ/EL antenna rotators to maintain accurate orientation in the direction of communication satellites. As an aid in locating and tracking satellites through optical means, PREDICT can articulate tracking coordinates and visibility information as plain speech.

This is the Windows version. Linux and Sharp Zaurus PDA version are also available

For more details visit the homepage and do not forget to get the most recent update of the orbital elements file here (file tlexxx.zip, in which xxx is day of the year - for accurate predictions the secret is to update regularly); as well as the Level 3 Earth Map (allows increased zoom).

Since version 0012, it is now also possible to self-update the TLE file with a single key press by installing the additional STSUpdat program.

WinOrbit has 4 basic functions:

It was designed for use during the early stages of my satellite receiving activities, when clouds and interference prevented easy identification of what I was actually observing! Therefore WXtrack can read processed satellite images from one or more folders of your choice, and present these images side-by-side with the ground track prediction. To make visual correlation easier, minute markers are produced on the predicted image to match those on NOAA APT transmissions. Map overlay images suitable for subsequent combining with actual satellite pictures can be produced.

Features include the computation of Iridium Flares, the calculation of the transit of satellites across the Sun and Moon globes etc, etc...