Accuracy
EPE (the “Accuracy” shown on your GPS) is an estimation, rather than a measurement.
There is a difference between Accuracy and precision
To many people, accuracy and precision mean the same thing: to someone involved in measurement, the two terms should have very different meanings.
Accuracy - the degree of conformity with a standard
Precision - the degree of refinement in the performance of an operation
Look in your GPS manual and it will say something like “Accuracy of <15 meters”. This is it's degree of conformity to a standard i.e. within 15 meters of bulls eye. The EPE that is on your GPS however should often be as low as 4 meters. This is the degree of refinement in the performance of an operation. i.e a the uniformity of the co-ord within the aforementioned range of accuracy.
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| Accuracy | Precision | Accuracy with Precision |
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