Accuracy of GPS units is pretty much dictated by the sensitivity of the antenna, the number of satellites acquired, and the time you dwell at each point. All the handhelds use pretty much the same small patch antenna, and will have similar accuracy. That accuracy, for area measurement, is much better than the accuracy they display. The displayed accuracy is an absolute value, and what matters for acreage and distance measuring is the relative value. Just about any handheld will be more than adequate for anything short of a legal survey. If you need better, get a handheld that has an external antenna input connection, and buy or rent a good antenna. Antennas can get pretty pricey, though. Expect a good surveyor quality antenna to be up in the high hundreds or even thousands of dollars.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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