Affordable GPS roll steering for general aviationThe GPSS interfaces with the composite roll steering commands output by GPS navigators to fly a complete, pre-programmed flight plan—hands off. If the GPS database includes instrument approach procedures, the flight plan can also include an approach to the destination airport. GPSS is available as a standard feature on the System Fifty-Five X autopilot, and is also available as an upgrade to any existing S-TEC autopilot.*