GNC 420(A) Pilot’s Guide and Reference
SECTION 3
NAV PAGES
3-25
190-00140-20 Rev. K
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 nal (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 direct-
to waypoint (Figure 3-50). Once the prole is dened,
message alerts and additional data on the Default NAV
Page and the Map Page provide guidance to the pilot.
Figure 3-49 VNAV (Vertical Navigation) Page
6
5
1
4
3
2
8
7
9
Target Altitude
1
Target Distance
2
Altitude Reference (AGL or MSL)
3
Target Reference
4
Vertical Speed Desired
5
Vertical Speed Required
6
Current Page Group
7
Number of Pages in Current Page Group
8
Position of Current Page within Current
Page Group
9
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.
VERTICAL NAVIGATION PROFILE
VERTICAL SPEED REQUIRED
DISTANCE TO TARGET
TIME AND DISTANCE
TO PROFILE
TARGET ALTITUDE
AND POSITION
AIRPORT
CURRENT ALTITUDE
AND POSITION
Figure 3-50 Vertical Navigation Profile
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
