I usually slip in before daylight and let them do what turkeys always do and that is give away their location without ever have to use a call once. Gobblers will sound off from the roost without any help once daylight breaks.

I make a mental note of where they are roosting and then I take that information home and hit the satellite photos on google earth or google maps to see the layout of the terrain. From those photos I can select a good set-up location. I usally have a primary and an alternate.

That may not work for you, but it's what I do.