It all depends on the situation. I have been blown at completely covered in cover scent in a tower stand with all the windows closed. The buck is alerted to "something" that is not right, not so much just you. I have also been in the same stand with my youngest at the time (8 yr old) and hes playing with his gameboy and eating a sandwich and chip and making tons of noise and out walks a nice 6pt about 50 yards away that he shot at and missed. I figured it was just a day out with dad getting use to it and out walks the buck. So I think its really different for each situation.