Garmin G3X Pilot’s Guide190-01115-00 Rev. K101Flight InstrumentsSystemOverviewFlightInstruments EISCNSInterfaceGPSNavigationFlightPlanningHazardAvoidanceAdditionalFeatures AFCS Annun/Alerts Appendix Index2.3 VERTICAL NAVIGATION (VNAV)CAUTION: VNAV is only a VFR navigation aid and is not intended for instru-ment approaches.The Vertical Navigation Page provides settings for the vertical navigation feature.These settings create a three-dimensional profile from the present location and altitudeto a final (target) altitude at a specified location.When the VNAV profile is defined, the pilot is informed of the progress by messagealerts. A magenta chevron (VNAV Indicator) to the left of the altimeter on the VerticalDeviation Scale shows the VNAV profile, and a magenta chevron (Required VerticalSpeed Indicator (RVSI)) on the Vertical Speed Indicator indicates the required verticalspeed to reach the target altitude.The Vertical Navigation feature is only available when navigating a Direct-to or flightplan, and the ground speed is greater than 35 knots.One minute prior to the initial descent point the “Approaching VNAV Profile”message appears and the ‘Estimated Time to VNAV’ (on Active Flight Plan Page) goesblank. The descent angle locks to prevent changes in speed from altering the profile.The VNAV feature does not take into account any changes in ground speed that occurduring the transition from level flight to descent or climb.At 200 ft above the target altitude, the “Approaching Target Altitude” messageappears, and the VNAV indicator disappears from the PFD.
