IGMA-IGS Joint Trial Project pursues to develop an international GNSS Monitoring and Assessment System in order to demonstrate the user’s benefit of combined use of multi-constellations, enhancing the trust in GNSS Systems (GPS, GLONASS, Galileo, BeiDou) and RNSS Systems (NavIC, QZSS). GMV was selected to contribute to the IGMA-IGS Joint Trial Project due to its experience in GNSS solutions. Since the beginning of the project, GMV strived to provide reliable and high quality results related to the Terms of References (orbits and clocks accuracy, user range error, UTC offset error and PDOP) requested by the project. Considering the wide range of GNSS services GMV is involved in, it is not surprising the progress achieved so far. In this line, complete Monitoring and Assessment of GPS, GLONASS and Galileo Navigation Messages have already been achieved. For those, the four Key Performance Indicators have been computed in post-processing mode: Orbits and Clocks Accuracy, SIS User Range Error, SIS UTC Offset Error and PDOP. Furthermore, QZSS preliminary results regarding the Orbits and Clocks Accuracy are available. First implementations for BeiDou are ongoing as well, showing promising outcomes concerning the Orbits and Clocks Accuracy and further work is being made with regards to the rest of parameters. GMV has been working on deploying a Monitoring System, endowing it with robustness and configurability. In addition, an additional module of the software developed allows to easily compare results among Analysis Centers, which facilitates the detection of the differences in the outcomes. Some of those differences have already been analyzed and detected, i.e. use of ANTEX corrections, selection of the proper Navigation Message depending on the Time used (i.e. time of week, time of ephemeris), etc. Throughout this paper, the strategy followed to perform the Monitoring of the GNSS Performances will be presented, together with the full set of results and statistics for GPS, GLONASS and Galileo. Moreover, preliminary results for QZSS and BeiDou will be introduced. A comparison of the results provided by the rest of Analysis Centers will be also presented, as long as data is available (i.e. results of “SIS UTC offset error” have not been provided yet by any other Analysis Center).