Free: Contests & Raffles.
You answered it in your own question. Boots on the ground. You can look at mapsAll you want but you can only narrow it down to certain areas until you have to put some time and effort in and go check the areas out. The more you look at maps and check those spots the better you get at figuring out what to look for.
Also look at things like aspect: Where does the sun hit in the morning, where in the evening, what's the shade pattern. High hunt overlaps the equinox, so you can be pretty safe using due east/west.
Buy Robby Dennings book. Read it. End of story.Sent from my SM-N910P using Tapatalk