Real question here. I am trying to understand the difference between Navigraph data and AIRAC data which is available at the X-Plane Airport and Navigation Data link on the official X-Plane Downloads page. My understanding is that whenever I update X-Plane to the most recent version, the airport and navigation data will be updated automatically as well, if the update did happen to include new airport/navigation data. On page 69 of the CRJ manual, it makes reference to the Navigraph database that is installed on the CRJ, and the ability to purchase newer Navigraph data as new updates eventually become available. What I am wondering though, is the option to buy newer Navigraph data for the FMS: 1) a nice thing to do once in a while, 2) a necessity to do to, or 3) will the initial Navigraph data that comes with the CRJ be all that I am ever going to need. I don't mind eventually getting a Navigraph account for purchasing updated data for the CRJ, but can I get along without it? The other thought I had, would there ever be a situation that the X-Plane AIRAC data could conflict with Navigraph data to cause problems? Or, is it a case that the CRJ uses Navigraph data solely for the FMS,and doesn't access any other X-Plane airport/nav data? Also, if initial version 1.0 of the CRJ is updated to a version 1.1 at some point in the future, would such an aircraft update then come with a newer Navigraph database as well? Thanks.