From what I have read and supported by the tracks that I have seen, they typically only go 15-25 or so rows in to bed. Also from what I have seen they typically don't use the exact same trail every time, however they will generally exit the corn in the same area about an acre in size. They also tend to prefer certain areas of the cornfield over others. Four instance there may be one back corner where the deer always exit however you never see a deer on any other part of the field. This is probably due to factors outside of the actual field itself, like being in close proximity to another food source, water, or escape cover.
Call me crazy but I believe they here have a guidance system similar to that of migratory birds and fish except on a vastly smaller scale. And here are some examples of why I think that. Number one deer are not naturally nocturnal animals. Yet they seem to be extraordinarily talented at ambling around in the dark finding food, water, mineral sites and back to bed. While they can see better at night then we humans can they are not specially adapted for nighttime living like say an owl. It is for this reason I think its why we can walk up on dee a lot closer at night and they are seemingly not as afraid. Coon hunting at two or three in the morning I have had very nice bucks walk out of the woods into the field not 40 yards away and seemingly not care. They just look over and go about feeding or doing whatever they were doing. They see us. But the don't see us clearly like in the daytime so their tolerance of us is higher. So to get around that night that only leaves really there nose as a guidance system and we know that that would be highly inefficient. We know that they can smell objects very good but let's face it they're not exactly bloodhound tracking dogs that use their nose to navigate.
Another thing that gives me reason to believe they have some other type of guidance system is when a corn field is harvested or a section of the woods are clear-cut. For a period of days after that you will see dear continuing to do the same routine they were doing when the corn or trees were there. And they also stand in the open almost like they don't know that the corn or the trees are missing. I have seen a section of woods get cut and for a few days watched dear walk the exact trails they were walking before. However those trails no longer exist trees have been cut down put it in the path, bulldozers gone through, and the landscape is completely changed. Yet for a period of days they continue to do the same thing on the same route.
Siris voice to text Jack that all up I'm not going back to correct all those grammatical errors but you get the point lol.