Getting back to the GPS accuracy, I calc'd a quick diagram as seen below. If you have the proper coordinates of the section corner, and you can center yourself as the red reference line shows, and then walked in, you can see the arc distance you're dealing with on each side before you could potentially find yourself in the white (private).
At 20 feet out, on line, you have 16' of allowable error per side. The distance will change if you are not on line, and or the section corner was not entered correctly. That's asking a lot for a non-corrected GPS signal these days. Also keep in mind most guys are going to use their finger to touch and hold, and create a waypoint on what they think is the corner.
Something many of us can relate to, ice fishing holes. You cut a couple holes with no real snow on the ice. You smash the fish while everyone around you isn't catching anything. You drill a couple holes along side of it, still nothing. You mark the holes with your phone and the next time you come out, there is a foot of snow on the ice and your GPS is leading you to "that place". We've all been there, we're close, but we're still kicking snow away to find "That hole" All of the sudden your GPS jumps 20 feet, and you move, bingo, hole found fish on the ice. The hole is the section corner in this case.
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