Garmin G3X Pilot’s Guide190-01115-00 Rev. K319AFCSSystemOverviewFlightInstruments EISCNSInterfaceGPSNavigationFlightPlanningHazardAvoidanceAdditionalFeatures AFCS Annun/Alerts Appendix IndexAutomatic transition to ALTSMode with ALT Mode armedSetting the selected altitude (Integrated Autopilot Interface):1) From the PFD Page (one display) or PFD (two display), press the ALT/PTCHSoftkey.2) Turn the FMS Joystick to set the Selected Altitude in 100-ft incrementsSetting the selected altitude (GMC 305):1) From the PFD Page (one display) or PFD (two display), press the ALTSoftkey.2) Turn the FMS Joystick to set the Selected Altitude in 100-ft incrementsUse of the FMS Joystick to change the Selected Altitude while SelectedAltitude Capture Mode is active causes the autopilot to revert to Pitch HoldMode with Selected Altitude Capture Mode armed for the new SelectedAltitude.ALTITUDE HOLD MODE (ALT)Altitude Hold Mode can be activated by pressing the AP ALT Softkey orALT Key (GMC 305); the AFCS maintains the current aircraft altitude (to thenearest 10 feet) as the Altitude Reference. The Altitude Reference, shownin the G3X Autopilot Status Box, is independent of the Selected Altitude,displayed above the Altimeter. Altitude Hold Mode active is indicated by agreen ‘ALT’ annunciation in the G3X Autopilot Status Box.Altitude Hold Mode is automatically armed when in Selected AltitudeCapture Mode. Selected Altitude Capture Mode automatically transitions toAltitude Hold Mode when within 50 feet of the Selected Altitude. In this case,the Selected Altitude becomes the Altitude Reference.CHANGING THE ALTITUDE REFERENCEWhen operating in Altitude Hold Mode, the Altitude Reference can beadjusted in the following ways:
