OnX is one popular application for that type of thing, though mostly I see it used for off roading, but it would work for hunting as well. There are a couple of other apps out there as well, but OnX is the one I remember seeing.He was hunting in the HNF, had some sort of map app that let him know that the deer had crossed a property line. The difference in local plants tells the story without an app or even a fence, going from mature trees to junk jungle.