Hallo, I tried to construct a light that warns, when you are leaving altitude.Of course i failed, but the whole weekend was rainy.The light must go on when you are 200 feet + or - of the altitude set -in the autopilot altitude window.My gauges give red and orange lights when i'm above or under that alt.Thanks for the advices,PH-JVH

Sorry, I had to experiment further and not bother you with this question, because the answer was in the program itself:(A:Autopilot altitude lock var, feet) (A:Indicated altitude, feet) - abs d 300 >= r 1000 <= &&AltitudeCode here for the interested ones,PH-JVH