What is the procedure for verifying GPS data accuracy according to DMC 2010-13?

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Verifying GPS data accuracy is accomplished by tying the measurements to a network of known control points and adjusting the data to fit that network. This means using benchmarks with precisely known coordinates to perform a mathematical adjustment—typically a least-squares adjustment—so the GPS results align with the established reference framework. This approach yields corrected coordinates and quantified residuals, giving a clear measure of accuracy and revealing any systematic biases. It’s preferred because it provides a stable, traceable anchor for the survey data and directly evaluates how closely the measurements conform to the known control. Manual re-measurement is inefficient for broad verification, cross-referencing with satellite imagery doesn’t provide precise positional accuracy, and comparing with old survey data can be misleading due to changes or older errors.