Using SatSpy 2.0 in skytrace display mode, I simply use the magnify feature to blow up the area of the sky where I saw the unknown and click on the few traces displayed (which have direction of flight arrows to further reduce the possible candidates). Once the time that the selected satellite passed through that point is displayed, it's fairly obvious whether the selected trace was that of the unknown. I've positively identified many unknowns in this simple manner (unknowns being defined as satellites which I observed by chance with no printed skytraces on hand). > I would suggest that everyone who intends to do regular observing would do > well to get a program (Quicksat!) and (Molczan!) elements and learn to > generate their own predictions, but ESES seems to me to be a quick and easy > and reasonably accurate alternative for those who need or want it.