the one thing I always have with me are the county road atlas. its a life saver for knowing what is state land Vs. Private. the state land is plotted out to the 1/4 mile and its very easy to see where you could have strayed off the trail.
However.. I have seen folks try and say State land was someones Private property to keep you out of it. they have gone as far as to hang gates and wire accrossed legal forest roads.