Hi!
Thanks for the answer.
It will only show your position once for something around 5 seconds. Then your aircraft symbol and the device will disappear.
I also tried to set the NMEA_UDP to 0 and tried other ports, but it didn't work.
Now i deactivated all other scripts in the export.lua (Tacview, SimpleRadio, VAICOM) and deleted the files from the script-folder. Now it works fine!
I'm not able to figure out which of these scripts make some trouble in combination with the DCS_NMEA.lua. I will test around a bit by switching some scripts on and off, maybe i can help you with that.
Regards
Thomas