The "None" drift correction method calculates delta-g's between measured values at successive stations, without further correction. Although not generally used, the method may be useful for evaluating the magnitude of the drift correction, relative to the uncorrected delta-g's. The default standard deviation when using the "None" method is 3.0 µGal (the standard deviation used in the adjustment can be modified in the Network adjustment options dialog or edited in the delta table).
