This is why WY agreed you can step over if there is a physical mark. You just have to step over the "point" on the diagonal. How hard would it be for the state to mark a few hundred corners in WA? 3 interns using DGPS for a summer?Mathematically a corner is a point, it has no size, no length, no width, so you can not pass over that point or a line projecting from the center of the earth through said point and into space without violating the space around it, because you have size.
I apologize for posting a lot here...I've had some incredibly scary situations with unethical landowners and have called both the Adams and Grant sheriffs over illegal posting and stood my ground. I've been right each time, I use my maps carefully. On-X helps a lot but obstinate landowners can be scary. In WY the landowners immediately back-off if you pull out a GPS...not so much in Grant County.
