• Which the release of FS2020 we see an explosition of activity on the forun and of course we are very happy to see this. But having all questions about FS2020 in one forum becomes a bit messy. So therefore we would like to ask you all to use the following guidelines when posting your questions:

    • Tag FS2020 specific questions with the MSFS2020 tag.
    • Questions about making 3D assets can be posted in the 3D asset design forum. Either post them in the subforum of the modelling tool you use or in the general forum if they are general.
    • Questions about aircraft design can be posted in the Aircraft design forum
    • Questions about airport design can be posted in the FS2020 airport design forum. Once airport development tools have been updated for FS2020 you can post tool speciifc questions in the subforums of those tools as well of course.
    • Questions about terrain design can be posted in the FS2020 terrain design forum.
    • Questions about SimConnect can be posted in the SimConnect forum.

    Any other question that is not specific to an aspect of development or tool can be posted in the General chat forum.

    By following these guidelines we make sure that the forums remain easy to read for everybody and also that the right people can find your post to answer it.

Duplicate Waypoints Error

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Staff member
FSDevConf team
Resource contributor
We keep getting reports of Duplicate Waypoint Compiler errors. The most common way we know to do this is for the user to create an ILS on the same runway more than once. ADE allows you to do this (perhaps it should not). We are looking at how to stop it while still allowing users the flexibility.


Please be very careful when you add an ILS via the Right Click > Add Menu. ADE will offer you all the runways. Unless you are very clear what you are doing do not add more than one ILS to the same runway - they are very rare in practice and we suspect that users add them more by mistake than intent.

Also be aware that ADE creates an ILS approach by default when adding an ILS. This is almost certainly a good thing. However if you want to mess around with multiple ILS on a single runway we suggest that you uncheck the option to add an approach and then build your own in Approach Mode.

To fix the issue in versions prior to V 1.5 do the following:
  • Open Approach Mode via the button near top right
  • Go to Lists > Waypoints
  • Sort the list by Ident (click the Ident column heading)
  • Now select and delete any Waypoints that have the same ident leaving just one of each ident
  • Close the list
  • Go back to Airport Mode via the button near top right
  • Compile the airport
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