For purposes of WinOrbit, an observer is just a location on the
ground, with a
Latitude, Longitude, and Altitude.
A real observer, of course, might
visually or with a telescope for a satellite, or might have a ground
station consisting of some radios and antennas with which to attempt
communication to or through the satellite. In Amateur Radio jargon, the
observer's location is referred to as QTH, using an old Morse code
In addition to the principal observer (generally you), always displayed in the
main window, for whom the various calculations are performed, there may be
other observers of interest - those with whom you might share a
Mutual Visiblity Window.
These stations may be called DX, or distant stations, in Amateur Radio
jargon. You can get a list of all stations, including yourself, having mutual
visibility with a particular satellite by choosing
in the Map Window.
Observer data are contained in the