Global Navigation Satellite Systems (GNSS) are starting to offer freely available firsthand services to sustain user needs on accuracy, reliability and resilience in navigation. Examples of these services are the Galileo High Accuracy Service (HAS), in its initial phase since 24^th January 2023, or the Galileo Open Service Navigation Message Authentication (OSNMA). These services are extending not only the consolidated GNSS capabilities but also the perimeter of the system support, providing reference algorithms, guidelines, and standards to be implemented by the users to achieve the service goals. The Joint Research Centre (JRC) supported the HAS development in different phases. Currently, JRC has developed a monitoring system able to collect and analyze HAS corrections broadcast through the Galileo E6-B signal-in-space (SIS) and the Internet Data Distribution (IDD) channels. The corrections are collected and logged in the EU GNSS Hub of the JRC. The monitoring tool combines the SIS and IDD HAS corrections with the OS broadcast ephemeris of the Multi-GNSS Experiment (MGEX). HAS-based satellite positions and clock errors are compared against MGEX Rapid and Final products. Moreover, the position, velocity and timing (PVT) solutions obtained with the reference HAS User Algorithm are computed daily using GNSS measurements from a set of IGS receivers, worldwide distributed to ensure geographical coverage and a hardware in the loop solution developed at the JRC premises, which also allows the collection and analysis of SIS HAS corrections.

In his contribution a set of performance indicators are computed including HAS ephemeris errors and PVT error. Finally, different HAS UA configurations, including dual- and triple-frequency in single (Galileo) and dual (Galileo+GPS) constellation mode, are presented. The file logs of the SIS and IDD HAS corrections, their streams and the experimental HAS ephemeris, clock and bias collected and elaborated at the JRC are stored and made available for research.