I’ve used mine only to measure relatively small (1 – 3 acre) irregularly-shaped islands. With these the accuracy is usually within about 5% of the acreage shown on the tax documents (the accuracy of themselves which is questionable however…)
Generally the larger the plot being measured the more accurate the GPS acreage calculation. Ie. the measurement for a 300 acre field will be much more accurate than it will a 0.3 acre suburban lot.
Accuracy depends on the setup of the GPSR’s tracking feature. It can can improved by going to the tracklog setup menu and changing the record method from the default “auto” to “distance”, then specifying a very short distance (eg. 10 feet) for the “record interval”.
Other ways to improve accuracy:
Hold the GPS receiver so it always has a clear view of the sky - ie. so it can "see" as many satellites as possible. Keep it as high and as far from your body as possible.
Avoid travelling under heavy overhead foliage. This can cause the GPS to momentarily lose lock on the satellite signals. When this happens unit estimates track points based on the velocity/direction when the signal was lost.
Travel at a more or less constant speed - and make no stops - while measuring.
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