5-34Garmin G500/G600 Pilot’s Guide 190-00601-02 Rev. JCover TOCForewordSec 1SystemSec 2PFDSec 3MFDSec 4HazardAvoidanceSec 5AdditionalFeaturesSec 6Annun.& AlertsSec 7SymbolsSec 8GlossaryAppendix AIndex5.4.4.2 Autopilot Operation with the GDU 620 Emulating GPSSIn order to provide GPSS functionality for autopilots that do not have built-inGPSS support, the GDU 620 can convert the GPSS commands into a headingsignal. When GPSS mode is turned on, the autopilot heading mode will followthe GPSS commands instead of the heading bug. Refer to the Airplane FlightManual and autopilot system documentation for instructions on how to use theautopilot heading mode.Depending on the installation, GPSS mode may be toggled on/off with anexternal switch or by pressing and holding the HDG key on the PFD. If theinstallation uses the HDG key on the PFD, the PFD knob window will displaythe GPSS/HDG mode options.GPSS OFF GPSS ONFigure 5-34 GPSS Mode Control with the HDG KeyWhen GPSS mode is on, the heading bug on the HSI changes to a hollowoutline and a crossed-out heading bug appears in the PFD Knob Mode Indicator,indicating that the autopilot is not coupled to the heading bug. The bug is stillcontrollable and may still be used by the pilot for reference. GPSS is annunciatedin the lower left portion of the PFD. The GPSS mode annunciation depends onthe location of the NAV STATUS information, as shown in the following figure.NAV Status Style 1 NAV Status Style 2Figure 5-35 GPSS Mode Annunciations5.4.5 Flight Director DisplayIf autopilot flight director commands are interfaced to the G500/G600, theywill be presented as a single cue flight director on the PFD. Control of the flightdirector is accomplished via the autopilot/flight director controller; there are nopilot controls or adjustments for the flight director on the G500/G600.
