Sorry Bjoern,Today,I tried to fly with this aircraft and I realize that I totally stumbled.Now the aircraft just only following the first waypoint,after passing it,the aircraft is going same direction.And also ISG arose with a new problem.When you select the FPLN page from GNS,after passing an any waypoint,it has to be showed to you the next waypoint name and the heading course but now (with sperry 177) it's NOT.