Garmin XM, GPS/WAAS and XM/GPS/WAAS antennas are now available. The GA 56A currently ships with GNS 480, and the GA 56W will be the antenna that you receive as part of the 400/500 series WAAS Upgrade unit. These new WAAS antennas are not compatible with existing 400/500 series units. The new GA 57 GPS/XM/WAAS antenna may be ordered as an option with a GNS 480 that will be installed with a GDL 69/69A.