Nico,Are you by any chance using FSInn when flying online?I think I remember something about FSInn forcing the regional settings to something... But then afgain I could be remembering wrong...It definitely sounds like the regional setting is your problem, both for the FMC POS and the NAV RAD difficulties. Hope it helps,

Hi Mats,I fly online with IVAO. If the regional settings would be the problem, which items doI have to consider as vital?Regards,Nico

Mats,Finally the problem is solved. The regional settings were the causeof all the problems. Everything works fine now. I have done a dozenof flights without errors.Thanks to you and everybody who read and answered my questions.Regards,Nico Dhondt