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Course Drift in Navigation Display

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    Course Drift in Navigation Display

    I have been using FSX SP2 with PMDG 747-400 for quite some time now. Probably over 1000 hours and all has been perfect. I use Navigraph and keep the database up to date. I have also installed textures on occasion.

    Recently I installed a couple of payware aircraft that turned out to be crap, in my opinion. They have all been deleted. One product installed by one of them was FS2Crew. I never used it nor did any 'alignments' or anything related to FS2Crew. (I didn't see that untill I was removing everything.)

    Ever since that time I have experienced an unusual situation in the PMDG 747. No other plane is affected. Quality Wings is the only other payware still installed and it works normally. The stock FSX 747 and all others works well.

    When I take off I am obviously over the runway. Perhaps just left of center-line and 100 feet. By that time the navigation display already shows that the runway has drifted left and I am barely over it. By the time I get to 1000 feet I am well off the center-line of the runway, even though outside cameras show that I am still on center-line.

    Enroute the navigation constantly drifts left and I end up 5+ miles right of course. The aircraft maintains a constant left bank of 1-3 degrees to try to correct, increasing as I get closer to waypoint, and by the time I approach a waypoint I am at a 20 bank angle and near a 30+ intercept angle to the waypoint.

    Autoland to an airport ends up landing 300+ yards right of the runway at an approach angle of about 15-20 degrees to center-line. The localizer needle is well left. If I manually fly the localizer needle I would land on center-line lined up perfectly.

    So, I have uninstalled. Removed all PMDG folders. Rebooted. Then reinstalled PMDG 747. The anomaly persists. I am down to removing all FSX and all payware, removing folders, and starting from start again.

    Any clues how this can be repaired without having to go radical and uninstall FSX and everything?

    Thanks for any assistance short of reinstalling FSX in full.

    Mark Taylor

    It has been years since I had to use FSX and my memory is poor, but I recall that track errors could be cause by a minor error in the registry. Flight1 had, and may still have, a free registry repair tool that fixed this problem.
    Dan Downs KCRP
    i7-10700K 32GB 3600MHz 1080Ti


      Originally posted by DDowns View Post
      It has been years since I had to use FSX and my memory is poor, but I recall that track errors could be cause by a minor error in the registry. Flight1 had, and may still have, a free registry repair tool that fixed this problem.
      "FSX/FS9 Registry Repair Tool (36KB) - This tool will repair your FSX or FS9 registry so that the path is valid. Many times certain applications use this path. If it is invalid, some programs may not work."

      I read this as the File path, not the flight path. Just how poor is your memory? Do you remember this having to do with certain applications no longer working due to a bad path in the registry, and this fixed it?

      Mark Taylor


      • DDowns
        DDowns commented
        Editing a comment
        Yes, flight path. It doesn't make sense, and it is odd, which is probably why I remembered it. Try it, it cannot do any harm.

      Well that didn't do it..... I've got only a couple of more things to try before I uninstall FSX. What a pain that will be...

      Mark Taylor
      Last edited by mdtaylor; 05Sep2020, 16:07.





        while I understand your polite approach towards these other addons not to name them I think it could help if we knew what these crappy addons are. Many people here have been simmers for decades and have tried out a lot so maybe someone remembers something that might help.

        But check one thing please, I don't know if PMDG FSX addons may suffer from it, but worth a try: In your realism settings in the left bottom corner there is a setting like "enable inertial drift" or "gyro drift" or something similar. check that it's turned off.

        Another guess: Remove any saved PMDG panel states in your FSX main folder/PMDG/747. It could have become corrupted too.

        Do you use FSUIPC?
        i7-6700k, GTX 1080TI, 32GB DDR4 RAM @2666MHz, 4k
        Marc Ehnle


          Yes, I do use FSUIPC. It seems to work fine in other aircraft.

          By crappy, of course I mean that they just did not perform as expected. Alabeo makes a Conquest II, and I wanted it because I spent a lot of time in my younger days flying one of those for a living. Turns out the freeware version from somewhere else would have been better. I just couldn't find it and thought for $25 a payware would have been better. it wasn't.

          The I got Aerosofts 737. It installed FS2Crew. I did not like that one either.

          Somewhere, in this time frame I went back to the 747 and found what is now happening. Hopefully someone else has run into this. In all my years from the early days of Flight Simulator I have not experienced this. My first payware aircraft is this 747 and I love it. I'd buy a new computer just to be able to keep it. Nothing else matters.



            Mark, I'm out of ideas but the guys at PMDG Product Support might come up with something. Open a support account (they are separate from sales and forum accounts) at and describe you problem on a support ticket.

            Please do post the solution when you find it.
            Dan Downs KCRP
            i7-10700K 32GB 3600MHz 1080Ti


              Unfortunately you don't say which version of the PMDG B747-400 you are using (i.e. the B747-400X DVD version or their latest downloadable B744 QOTS II for FSX. Just make sure you have the latest version installed from your PMDG online account. Then, before you submit a support ticket check out this link and make sure your FSX's magnetic variation and Navaids are also up to date:-

              If these suggestions don't fix your problem then submit a support ticket as Dan has already suggested. Good luck!
              Michael Codd


                I download the product from my account page. This is the ELUA from the download:VERSION v2.10.0040
                Plus, I installed a livery with the file name: PMDG744X_PW_UA3.exe
                FSUIPC is version 4.975a
                Navigraph to load the FMS and currently on Cycle 2009

                The support ticket was submitted and almost immediately got a reply to clarify the version. Whether it was the legacy 747-400 or Queen of the Skies II.

                I don't really know. The ELUA also says:
                ================================================== ====================
                PMDG 747 400 Queen of the Skies for FSX VERSION v2.10.0040



                Is this the Legacy or the Queen of the Skies II?
                Last edited by mdtaylor; 05Sep2020, 04:23.


                  Moved to the legacy section as this is for the legacy 744
                  Chris Makris (Olympic260)
                  PMDG Technical Support


                    Originally posted by Douglas Dragone
                    Hi mark!
                    Despite the problem, you have it installed and flying.
                    Your problem will solve it, I'm sure.
                    I also love the 747 and MD11 (try the MD11, you'll love it) I am still waiting for the PMDG solution to enjoy as you do.
                    Randazzo, when it will be ETA for FS9, the best simulator Microsoft has made to date. This is getting ridiculous.
                    Could you please not hijack threads? You were given an answer on the thread you open from Robert.

                    Thank you
                    Chris Makris (Olympic260)
                    PMDG Technical Support