Garmin aera 500 Series Pilot’s Guide 190-01117-02 Rev. A40GPS NavigationOverviewGPS NavigationFlight PlanningHazard AvoidanceAdditional FeaturesAppendicesIndex2.3 vertical NaviGatiON (vNav)The VNAV function provides settings for the vertical navigation. These settings createa three-dimensional profile from the present location and altitude to a final (target)altitude at a specified location.When the VNAV profile is defined, the pilot is informed of the progress by messagealerts. The teal bar on the HSI (when displayed) shows the VNAV profile.The Vertical Navigation feature is only available when navigating a Direct To or flightplan, and the ground speed is greater than 35 knots.The “Approaching VNAV Profile” message appears one minute prior to the initialdescent point. The descent angle locks to prevent changes in speed from altering theprofile. The VNAV feature does not take into account any changes in groundspeed thatoccur during the transition from level flight to descent or climb.At 500 ft above the target altitude, the “Approaching Target Altitude” messageappears, the ‘Estimated Time To VNAV’ goes blank, and the VNAV indicator disappearsfrom the HSI.CAUTION: The aera is a VFR navigation tool and should not be used to performinstrument approaches.CAUTION: VNAV is only a VFR navigation aid and is not intended forinstrument approaches.VNAV ProfileGlide Ratio to TargetDistance to TargetDistance to ProfileTarget AltitudeAirportVisual Representation of VNAV
