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Line of sight doesn't even matter any more, the GPS is a walk up set the point machine. But it costs over 50k. per instrument. One or two guys, plus the maps and filing the paper work with the county. Even though they did it once, 15 years ago, they aren't going to refile without seeing the corners. That acreage probably isn't square, lots of points to check, maybe re set. 4k would be cheap around here.
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