How Accurate is GPS Tracking?
GPS tracking is very accurate, almost all of the time. Global Positioning Satellites are owned and operated by the US government and they are committed to providing GPS to the civilian community at the performance levels specified in the GPS Standard Positioning Service (SPS) Performance Standard. For example, the GPS signal in space will provide a "worst case" pseudo range accuracy of 7.8 meters at a 95% confidence level.
Actual accuracy obtained depends on factors outside the US government's control, these may include atmospheric effects and conditions and the quality of the GPS receiver. Some high-quality GPS SPS receivers currently provide better than 3 meter horizontal accuracy, in real-world situations.
In practice, civilian GPS is accurate to within about 7 - 10 meters 95% of the time.
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