Geometric altitude minus barometric altitude, in feet. Undefined if not available.
Indicated airspeed in knots. Undefined if not available or the message reports true airspeed instead.
Magnetic heading in degrees. Undefined if not available.
True airspeed in knots. Undefined if not available or the message reports indicated airspeed instead.
Vertical rate in feet per minute, positive for climbing. Undefined if not available.
Source of the vertical rate measurement.
Airborne velocity decoded from an airspeed subtype (3 or 4) message.