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NAVITEQ establishes the first nationwide GNSS network in Bulgaria. It is a private project that offers an inexpensive way of precise positioning by transmitting correction data. The main purpose is to provide services to GNSS users that need centimeter and sub-centimeter accuracy. NAVITEQ provides three types of services called Naviteq Post Processing, Naviteq VRS and Naviteq PreciseRTK. There is another service in real time mode that is under development. The NAVITEQ reference stations positions are determined in...

Each of the spatial methods provides data in a different and a unique way for the three main geodetic directions: geometry of the Earth – coordinates of points and deformation; orientation and rotation of the Earth; gravity field as well as its variations. One of these methods, which is the most accurate and hopeful nowadays, is the Very Long Baseline Interferometry. In this paper it is gone into the technique of VLBI and its applications, mainly in geodesy and geodynamics. It is made an analysis of the motion o...