Unable to start xPlane 11

Can someone help me please.

I have updated Navigraph FMS dat to to 2207 as I had a couple of aircrafts that were not up to date. I tried to start up xPlane 11, but I had the following message " Loading navigation data failed. Cycle mismatch between earth_fix.dat and earth_nav.dat. These files must come from the same data cycle."

Could some one please advise to overcome this problem.

Thank you in advance.

Miklos Cserny

Hi Miklos,

You may have copied navdata to the wrong location. I suggest

Make sure X-Plane is not running.

Run … your X-Plane 11\X-Plane 11 Installer.exe with Update X-Plane option to check installed files and restore file structure.

In FMS Data Manager Settings, check you are running latest Version . If not please download and install FMS Data Manager.

In FMS Data Manager Settings, check your X-Plane 11 path is correct, by navigating to X-Plane.exe.

In Addon Mappings, delete entry X-Plane 11 (11.50+).

Press Scan. Are you now seeing entry X-Plane 11 (11.50+) ?

If yes, in Addon List please select X-Plane 11 (11.50+) and Update.


Thanks Ian, I will try.

Thanks Ian, it has been sorted out.

Hi Miklos,

You are welcome. Glad to hear.

Happy flying.


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