programs
Once you learn the system, those programs are dead on accurate...like the previous posters said, you must enter the correct information first, to get an accurate data output. I have two of the three programs, and either one is worth their weight in gold medals...with my sight tapes, my shooting partners and I have amassed many trophies, stste championships, and national placings in all of the archery venues...I would bet the farm on my tapes at any distance anytime...these programs are the first tool any serious archer should have in their arsenal.