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 - A Lifetime of David Brown Tractors - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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