@Gkikas-LGPZ Thank you very much!

@idefix37 Hey, I do not agree, (air)speed can be considered purely mathematically (no relation to the performance of the UAS / aircraft / sail... even though we can define those parameters there as well). No relation to the performance. So setting airspeed, and using wind model you can easily get the ground speed. I got the answer from Gkikas, that by this setting you set the ground speed. So, no dilemma. However, it would be much more beneficial to be able to set the airspeed (which is an airplane performance-driven setting) and then use your nice mathematical wind model to get actual ground speed. This is user based point of view. Thanks for the answer.