A FORTRAN 77 software package that analyzes Global Positioning System (GPS) deformation control networks is available free of charge. This package is able to simulate and adjust GPS networks. It can also perform onedimensional, two dimensional, and three-dimensional statistical analysis to study the significance of coordinate differences coming from two repeated surveys of the same network. In addition, the package computes displacement vectors with error and reliability ellipsoids, and it is suited for both engineering and geophysical applications. It has been used successfully in Italy to analyze small and large networks established for high precision engineering surveys and geodynamic deformation control [Acker et al., 1998; Anzidei et al., 1996].
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