inline double get_V_ground_speed() const { return v_ground_speed; }
inline double get_V_ground_speed_kt() const { return v_ground_speed * SG_FEET_TO_METER * 3600 * SG_METER_TO_NM; }
inline double get_V_ground_speed() const { return v_ground_speed; }
inline double get_V_ground_speed_kt() const { return v_ground_speed * SG_FEET_TO_METER * 3600 * SG_METER_TO_NM; }