I use the Sportsman Tracker hunt predictor app. I wouldn't say it's dead on accurate, but it has helped me choose which days and what time of the day to go. IDK if it was luck or just accurate, had a time where the app said the major feeding period time was at 8 am for my location. At exactly 8, 3 does walked out into the plot and started feeding. I'm going to say it was pure luck haha. BUT the app did help me put some meat in the freezer that day! I also use the Google Earth map to study new areas that I'm thinking about hunting.