inline double get_nav1_heading() const { return nav1_heading; }
inline double get_nav1_radial() const { return nav1_radial; }
inline double get_nav1_target_gs() const { return nav1_target_gs; }
inline double get_nav1_heading() const { return nav1_heading; }
inline double get_nav1_radial() const { return nav1_radial; }
inline double get_nav1_target_gs() const { return nav1_target_gs; }