Garmin GNC 420W Pilots Guide - Page 59

SECTION 3 NAV PAGES 3.9 Vertical Navigation Page The GNC 420's Vertical Navigation Page (the last NAV page, see Figure 3-49) allows the pilot to create a three-dimensional profile which guides the pilot from the present position and altitude to a final (target) altitude at a specified location. This is helpful when the pilot would like to descend to a certain altitude near an airport or climbing to an altitude before reaching a route or directto waypoint (Figure 3-50). Once the profile is defined, message alerts and additional data on the Default NAV Page and the Map Page provide guidance to the pilot. 1 2 3 4 NOTE: To use the vertical navigation features, ground speed must be greater than 35 knots and the pilot must be navigating to a direct-to destination or using a flight plan. PROFILE VERTICAL NAVIGATION CURRENT ALTITUDE AND POSITION TIME AND DISTANCE TO PROFILE VERTICAL SPEED REQUIRED DISTANCE TO TARGET TARGET ALTITUDE AND POSITION AIRPORT Figure 3-50 Vertical Navigation Profile 5 67 8 9 Figure 3-49 VNAV (Vertical Navigation) Page 1 Target Altitude 2 Target Distance 3 Altitude Reference (AGL or MSL) 4 Target Reference 5 Vertical Speed Desired 6 Vertical Speed Required 7 Current Page Group 8 Number of Pages in Current Page Group 9 Position of Current Page within Current Page Group Creating a vertical navigation profile (Figure 3-50): 1) Press the small right knob to activate the cursor. 2) Turn the large right knob to highlight the target altitude field. 3) Turn the small and large right knobs to select the target altitude (Figure 3-51) and press the ENT Key. Figure 3-51 Target Altitude Field Selected 190-00140-20 Rev. K GNC 420(A) Pilot's Guide and Reference 3-25