The Seat of Topography and Photogrammetry of the Civil Engineering Department of Pisa University has been long working on the set up and the utilization of a master permanent station located c/o its structures (Fig. 1), whose recorded data have been made officially available since March 2006. This GPS master is borne as support in scientific and academic activities and could be a reference point for regional GPS permanent net. This paper shows the architecture of the permanent station as well as the surveys which led to the determination of its global coordinates. An example of exploitation of permanent station data, aimed at monitoring a master GPS located in the proximity of the VIRGO interferometric antenna for gravitational waves (Cascina, Pisa) is also described.