Ever Ever heard these questions? Does anyone other than the VA use VistA?.... and by the way, how many VA healthcare facilities are there? Where else is it installed? Who else uses VistA, or one of its derivatives?. Roger Maduro, Publisher and Editor-in-Chief of Open Health News (OHN) will introduce the VistA Installations GIS map & Database v1.0 developed with real data provided by users and companies related to the implementation and development of VistA. Be ready to be surprised by this great effort.