Garmin GNC 420 - Manual (Page 61)

GNC 420(A) Pilot’s Guide and Reference
SECTION 3
NAV PAGES
3-27 190-00140-20 Rev. K
With the profile set, the vertical speed required (VSR)
is displayed on the Vertical Navigation Page. Expect the
following to occur when using the vertical navigation
feature:
• At one minute prior to reaching the initial descent
point, a message ‘Approaching VNAV Profile’
occurs. The descent (or climb) angle also locks to
prevent changes in speed from altering the profile.
• If selected, the vertical speed required (VSR)
readout on the Default NAV Page and the Map
Page show the desired vertical speed to maintain
the proper descent (or climb) angle.
• At 500 feet above (or below, for a climb) the target
altitude, an ‘Approaching Target Altitude’ message
is provided. The VSR readout on the Default NAV
Page and the Map Page is blanked out, at this
point.
Vertical navigation messages can be turned on or off,
they are off by default. Turning the messages off allows
the pilot to keep the previous profile settings, without
having them generate messages when the feature is not
needed.
Disabling/Enabling the vertical navigation
(VNAV) messages:
1) Press the MENU Key to display the Vertical
Navigation Page Menu (Figure 3-55).
Figure 3-55 VNAV Page Menu
2) With ‘VNAV Messages On?’ highlighted,
press the ENT Key. Or, if the messages are
already on, to turn them off, make sure ‘VNAV
Messages Off?’ is highlighted and press the
ENT Key.