Onx maps for me as well. I have a couple state chips for my gps unit...but going forward, I think I would just subscribe to their program ... for like 30 bucks a year you can get all the maps on your smartphone.
Not sure of the details but that is cheap for all of the info you get.
Mark
edit...Ive not used anything from gps file depot, but with the onx maps wherever you are standing it will tell you if you are on public or private, and gives you the landowners name for the private, as well as the hunting unit you are standing in (boundries). as well as other info.