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I presume he is referring to the kind of GPS surveyors use (we have one at my office) which are EXTREMELY accurate. These are machines (not totally unlike the surveying equipment shown in the video) that are more expensive than most of our cars. When we talk about GPS systems on these threads, we're talking about $300 handhelds that certainly don't have the same level of technology. Furthermore, a lot of the inaccuracies in the handhelds can possibly be attributed to the actual mapping as opposed to the tech.