void updateActualState();
void updateModelProperties(double dt);
void handleATCRequests();
- void checkVisibility();
inline bool isStationary() { return ((fabs(speed)<=0.0001)&&(fabs(tgt_speed)<=0.0001));}
inline bool needGroundElevation() { if (!isStationary()) _needsGroundElevation=true;return _needsGroundElevation;}