i think a game cam would help to a certian extent. If you know the land really well and know where these birds are going you could set up a cam somewhere along those lines and it would help give you a insight of their daily routines. But the downside to that i belive is if you don't know the areas well and you see areas that have been occupied with turkey sightings it gives you a little open window for a limited time but when spring time comes Turkeys may have adapted their movements to where hens are roosting and where they go to to feed and other strutting zones.

What else can you add to this guys? im out of ideas.