Not to stick up for the landowner as thats not how I act when I have to confront people, but onx and our phone gps isn't perfect. Unless you have a surveyed property line they may or may not have been on this farmers land. I don't think any of us would want our neighbors putting their fence or garage or garden in our yard. Landowners can get a bad rap and this guy was definitely over the top on his reaction, but when hunting edges as you say, in my opinion you better be damn sure you are on the right land as fences and field edges aren't always the true property line and anyway you cut it the landowner owns that land not you.