Do NOT call to birds while scouting this can only cause harm as they might spook causeing them to become call shy. I would walk through the timber (if any) and look under any potential roosting trees for sign. Oaks are about the turkeys favorite tree around here. If you know birds are around that corn field will be your best friend if you can hunt it when the sprouts are just starting to come up as the turkeys love to eat them.