X-Plane 11.55 cycle mismatch earth_fix.dat and earth_nav.dat


after update to cycle 2113 xplane11 won’t start. “Loading navigation data failed.
cycle mismatch between earth_fix.dat and earth_nav.dat. These files must come from the same data cycle.
Olease note that X-Plane 11 is not compatible with files made for X-Plane 10”

In FMS Data Manager on the rihth side I have to restore to 2113 but now purple instead of green and X-Plane 11 will start.

What to do?


Hi Götz,


Make sure X-Plane is not running.

You may need to 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, check you are running latest Version . If not please download and install from 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.


Hello Ian,

thanks a lot! It worked. I had to update the FMS Data Manager an followed all the steps of your posting.


Hi Götz,

You are welcome. Glad it is resolved.

Happy flying.


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