Habitat specialist Neil Dougherty's best tool to consistently bag 4-plus-year-old bucks on his property is a map of wind patterns. It's pretty simple: Dougherty starts with an aerial photo that has as much detail as possible (usually from globexplorer.com). On a clear overlay, he notes the day's weather conditions, temperature, wind speed, and general wind direction. Then, using a good wind check, such as Wind Floaters or a child's bubble-blowing gun, he walks the property, checking the wind every 100 yards (both length and width). He marks a small arrow on the overlay to indicate its direction for each test. "When I'm done, I can literally see how the wind swirls here or shifts there. And by making several maps over several days, I can predict what the wind is doing under a variety of conditions." As he plans a hunt, Dougherty looks at the forecast, studies the appropriate overlay, and keys into the places where two or more air currents collide, especially downwind of feeding areas. This, he says, is where big bucks go, to test the wind for danger, to scent for does, even to bed. "Mature deer know where every one of these max airflows are. Now I do, too."