There are a ton of variables with regards to scent and wind drift. Basically your scent travels in a cone shape from the ground and when elevated will cone down from your stand. The more humidity and moisture the heavier your scent will be. When laying a scnt trail, I know this violates the rules, but... lay a trail with the wind, that forces a deer to keep their nose to the ground versus wind checking or throwing their head up when against the wind. If you go in early enough, you can do this without getting busted. Light arid days your scent will travel further and on strong windy days your scent cone will be much narrower but will travel a great distance. As mentioned earlier, getting busted at 200 to 300 yards is not uncommon. Use anti bacterial soap, and be very scent conscience with your clothing. It's all part of the game and that is what makes it fun and challenging. LOL