The natural space of mathematical development of a GPS vector network is the global geocentric system WGS84. If necessary to integrate the conventional and satellite measurements, a more appropriate solution is to bring the GPS vector network onto the plane of the local projection and to adjust it as a horizontal network. One problem may be a suitable preparation of GPS pseudo-observations on the plane. In this work there is presented the complete calculation algorithm to transform the original GPS vectors to form a pseudo-vectors in the plane of "2000" system. There is also enclosed a numerical example based on the results of a periodic control measurement of the landslide area. The results obtained (the horizontal coordinates adjusted in the "2000" system) have been next compared to both the results of original GPS network adjustment and the results of the classical terrestrial measurement.
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