It's just that land isn't a flat 2D plain, and plots aren't quadrangles. It's more complicated than driving stakes into the ground at the corners. Then there's

It's just that land isn't a flat 2D plain, and plots aren't quadrangles. It's more complicated than driving stakes into the ground at the corners. Then there's the matter of the ground shifting and weather affecting the beacons. I agree that redundancy is good, but if terrestrial nav grids with ~4cm resolution were operationally easy we wouldn't be having this conversation.