The W (WAAS) systems have the same capabilities as the 400/500 systems and more. With the WAAS signal being acquired, the GPS can give vertical guidance to a runway similar to an ILS glide slope indication. WAAS units have added display capability when connected to a GDL-69(A) XM Satellite weather/radio receiver. W units also have additional ARINC 424 leg types to guide a compatible autopilot through procedure turns and published holds.