ORIGINAL: Cut N Run
It amazes me how Gobblers can zero in on your location after only one series of calls made 30 to 40 minutes before they come to them.
I'm probably just splitting hairs here, but try this idea on for size: I theorize that turkeys zero in on the most likely position rather than the exact location. Let's say you set up at a likely spot, a peninsula of oaks jutting out into a fallow field. You call. The gobbler walks on your call and flys on over and lands within a few yards.
Did he have super-directional hearing that pinpointed you to within a meter? I don't think so. I think you decided to set up in a likely spot, and the turkey took that sound and roughly triangulated it in his head and then compared it to his internal map. The most likely spot that sound was coming from would be . . . lessee. . . hmmm. the penninsula??? Off he goes. My reason for making this distinction is that I believe you need to be in a somewhat likely spot to begin with. A tree call and a flydown cackle from the middle of an open field is not going to cut it.
I also think that gobblers do some basic reality checking before they come pitching in as well. If there was no flock of hens there at fly-up last night, you'll have a harder time convincing the gob that there is one there in the morning. The most successfuly flydown setups I've had have included bumping a hen or two out of tree in the dark on the way in. In fact, I always count myself blessed if I can bumble on hens. I figure they did 90% of the selling the night before.