1. A method for determining the position of underground pipeline features or defects in terms of global positioning system coordinates, comprising: having globally positioned control points along the pipeline; identifying pipeline features or defects using an in-line inspection tool; identifying the geographic location of the pipeline features or defects and the globally positioned control points using an inertial navigation system; adjusting the geographic location determined for the globally positioned control points by the inertial navigation system to the accuracy of the global position of the globally positioned control points; calculating the geographic location of the features or defects located between the globally positioned control points.