Garmin aera 660 aera 660 Pilot s Guide - Page 59

Overview Navigation 2.3 VERTICAL NAVIGATION (VNAV) The VNAV function provides settings for the vertical navigation. These settings create a 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 message alerts. 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 flight plan, and the ground speed is greater than 35 knots. The "Approaching VNAV Profile" message appears one minute prior to the initial descent point. The descent angle locks to prevent changes in speed from altering the profile. The VNAV feature does not take into account any changes in groundspeed that occur during the transition from level flight to descent or climb. Navigation Flight Planning Hazard Avoidance Additional Features Appendices At 500 ft above the target altitude, the "Approaching Target Altitude" message appears, the 'Estimated Time To VNAV' goes blank, and the VNAV indicator disappears from the HSI. CAUTION: The aera is a VFR navigation tool and should not be used to perform instrument approaches. CAUTION: VNAV is only a VFR navigation aid and is not intended for instrument approaches. VNAV Profile Distance to Profile Glide Ratio to Target Distance to Target Target Altitude Airport 190-02017-20 Rev. A Visual Representation of VNAV Garmin aera 660 Pilot's Guide 43 Index