The use of Global Navigation Satellite Systems (GNSS) has become indispensable in today's everyday life. In recent years, the systems have been modernized. This paper provides insight into the current state and planned development of two global navigation systems, GPS and GLONASS. The RINEX format is described, without which the entire cooperation and operation of the system would be impossible. The value of DOP as criterion for satellite configuration quality is explaned. The work of CROPOS and its services is described since it forms the basis for geodetic and cartographic activities and at the same time provides data for surveying, mapping, navigation and scientific research. For the purpose of planning observations, the Trimble Planning application was used, the results of which are explained in detail. The geodetic microgrid was measured in the form of a geodetic quadrangle in the area of the city of Zagreb using the method of relative static positioning. Measurement processing and network adjustment were using two independent approaches. The first method was performed using the software MAGNET Tools, which is a product of the company Topcon. The second approach was performed using the WaSoft software in which the baselines were adjusted and the JAG3D software in which the geodetic grid was adjusted.