5-33190-00601-02 Rev. J Garmin G500/G600 Pilot’s GuideCoverTOCForewordSec 1SystemSec 2PFDSec 3MFDSec 4HazardAvoidanceSec 5AdditionalFeaturesSec 6Annun.& AlertsSec 7SymbolsSec 8Glossary Appendix A Index5.4.4 Autopilot NavigationThe HSI may be used in conjunction with the appropriate navigation modesof supported autopilots. The GDU 620 provides the autopilot with the selectedcourse and lateral/vertical deviations. The GDU 620 acts as a switching sourcebetween the installed navigation sources (e.g GPS/VLOC, 1-2). The navigationsource that is displayed on the HSI is sent to the autopilot. Refer to the AirplaneFlight Manual and autopilot system documentation for instructions on how touse the autopilot navigation functions.GPS Steering (GPSS) provides roll command signals calculated by the GPSnavigator to the autopilot in order to allow the aircraft to anticipate turns, makesmooth transitions when passing waypoints, and fly leg types such as ProcedureTurns and Holding Patterns. The autopilot must have the ability to interpret theGPSS commands. The G500/G600 can provide GPSS information to autopilotsthat have built-in support for GPSS commands, as well as to older autopilotsthat do not have built-in support for GPSS.Wpt 1Wpt 2Wpt 3AircraftPresentPositionFlight Plan Leg 1 Flight Plan Leg 2TurnAnticipationCurveFigure 5-33 GPSS Turn Anticipation5.4.4.1 Autopilot Operation with GPSS Enabled AutopilotsSome autopilots have built-in support for GPS Steering (GPSS) commandsfrom a GPS navigator. The GDU 620 will send the GPSS commands from thedisplayed GPS source to the autopilot. For example, if GPS 1 is displayed on theHSI, the GPSS commands from GPS 1 will be sent to the autopilot. Refer to theAirplane Flight Manual and autopilot system documentation for instructions onhow to use the autopilot’s GPSS function.NOTE: GPSS commands are not sent to the autopilot when a VLOC sourceis displayed on the HSI.
