This site is being deprecated.
Please see the official X‑Plane Support page for help.
You'll need to check to see if the NAVAIDs you are trying to use are actually in X-Plane. You can look on the local map if you know about where they are in the world, or you could look through the nav data text file available here. If they are missing and shouldn't be, please file a NAVAID bug here and include documentation showing they exist in the real world.
This site is no longer being actively maintained.