A GNSS positioning service is now completely available in Regione Lombardia. The Service provides raw data and MBS corrections, for both real time and postprocessing purposes. At first, the paper summarizes the main characteristics of the Service with a particular regard to real time services; then, the results of the first experiment on the reliability and the accuracy of the real time services are discussed. The experiment has involved several research groups; a common protocol has been agreed upon, which should simulate the typical static survey in real time, on the IGM95 network markers, whose coordinates are a priori known; the groups have then worked independently, with heterogeneous instrumentation: in total, more than 200 surveys on more than 100 points have been completed; moreover, for a subset of points, an independent static survey and the following postprocessing of the data have been performed. At first the data transmission problem emerged in the surveys are discussed. At the end, the comparison between real time results and reference coordinates, either from monographs or from data postprocessing, are analysed.
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