Try just listening for the " flap" of their wings when they fly up, sometimes it' s all you can get to go by for the next morning. On a quiet nite, if no major roads are nearby, you can hear a few birds fly up easily from 150 yards away. Listen for hens doing their " fly-up" cackles or cuts also. Birds don' t seem to respond to hoots or any locator calls where I hunt, so just listening for general sounds helps a lot. I have also done " mock" hunts in new areas during the sesaon, where I go into the woods prior to daylight, and purposely set-up out-of-the-way of the birds just to let them do their own thing, not calling or pursuing them so I can better get an idea of what they are doing. Of course, this only works if no other hunters are in your area, which also helps keep the birds calm.