The use of discrete GNSS (Global Navigation Satellites System) geodetic networks for the monitoring and study of ongoing deformations in areas of seismological and volcanological interest has had considerable development since the 1990s. Data from discontinuos geodetic networks have proven to be fundamental for the study of the seismic source and of the coseismic and post-seismic effects during the most important earthquakes that have hit Italy starting from the Umbria-Marche sequence of 1997 [Amato et al., 1998]. The tools used for geodetic data acquisition on the discrete networks managed by the National Earthquake Observatory (ONT) have followed the technological development of the main manufacturing companies (Leica, Trimble, Stonex). In this Technical Report will be described the...