![]() Provided you routinely access charts in your flying, you’ll also want to keep navdata up-to-date. Ground-based navigation aids are being removed and replaced by RNAV waypoints, new SIDs and STARs are published, and airports construct new instrument approach procedures. But, of course, real-world navigation is always changing. If you fly Prepar3D or X-Plane, the navdata included with your simulator generally reflects the world as it was when the simulator was built (using the current AIRAC cycle at that time). If you fly using a real-world IFR-certified GPS, you’ll be familiar with updating the navdata on the GPS every four weeks. ![]() In other words, every 28 days (and always on a Thursday), a new update is released simultaneously, around the world, with navdata. Established in 1964, AIRAC creates a 28-day cycle for navdata updates. AIRAC is an international standard for common dates and navdata to be provided for navigation around the world. In real life, navdata is related to Aeronautical Information Regulation And Control, abbreviated AIRAC. Navdata broadly consists of the waypoints, navigational aids (VORs, NDBs, ILSs, etc.), frequencies, and even airport information in your simulator. If your simulator flying involves online ATC or following real-world IFR charts and procedures, navdata is an important consideration for you.
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