Activating by GUGiK at the beginning of June 2008 multifunction system for precise positioning over the area of Poland, gave possibility for conducting geodesic work in the whole territory of the country. ASG-EUPOS system has been conducted within the EUPOS project. One of the assumptions of EUPOS project is usage of unified technical standards in the systems of all the member countries. It is done to ensure unified positioning over the whole coverage area of EUPOS system, also in the border areas where relying only on the reference stations of one country would result in decrease of the positioning accuracy. However doing measurements in the areas where for designating position, except from using national reference stations, usage of foreign stations is necessary raises concerns regarding reliability of positioning as well as integrating ASG-EUPOS and foreign systems with national geodesic warp. In this work the description of GBAS system has been done with particular interest in general assumptions and technical standards of European EUPOS system, together with its detailed Polish and Czech implementation, ASG-EUPOS and CZEPOS respectively. The concept of research verifying the operability of the ASG- EUPOS in the border areas was done. Following this concept measurement work was done in the area with the characteristic features of problem. Based on it the analysis of positioning precision with usage of ASG-EUPOS and foreign reference station was done against catalogue data. What is more the practical verification of recommendations included in project of technical guidelines G-1.12 was done.

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