Garmin GDU™ 37X Pilot’s Guide190-01054-00 Rev. E 41GPS Navigation Overview GPS Navigation Flight Planning Hazard Avoidance Additional Features Appendices IndexAt 200 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 GDU 37X and the VNAV function are only VFR navigation aidsand are not intended for instrument approaches.VNAV ProfileGlide Ratio to TargetDistance to TargetDistance to ProfileTarget AltitudeAirportVisual Representation of VNAVUSING THE VNAV FEATUREUse the VNAV (Vertical Navigation) feature to ensure the aircraft is at the properaltitude. The VNAV Indicator appears on the HSI (when displayed) as a horizontal lightblue bar. A message appears when approaching the VNAV Profile. When the bar is inthe vertical center of the HSI, the aircraft is at the proper altitude for the VNAV Profile.Configuring a VNAV profile:1) While navigating a flight plan or direct-to, press the FPL Key.2) Turn the FMS Joystick to select the Vertical Navigation Page.3) Press the FMS Joystick to activate the cursor.4) Enter the desired profile into the fields, and press the EXIT Softkey.
