Property corners are (re) set based on recorded deeds, historic surveys, and surrounding property markers. All the historic inaccuracies of previous surveys have to be factored in when setting the location of the corner. This is an issue for registered land surveyors and lawyers, not fancy tools like GPS. There is considerable interpretation and judgement required.
Ordinary handheld GPS units, even with WAAS, are accurate and repeatable to 12 feet or so best case. Only differential GPS, with a base station over a known point, has much use in survey work, and this is usually used for construction and intra-parcel work, not setting property corners. Yes, you could use differential gps to come back and find a property corner, and to check whether it had been tampered with, but not to set it.
The everyday tool of the surveyor is the total station, which is basically a combination of an theodolite and electronic distance measurement.
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Today's Featured Article - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
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