Garmin GNC 420AW GPS Receiver User Manual


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2 - NAV PAGES
58
190-00356-00 Rev E
Vertical Navigation - VNAV
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Prole”
occurs. The descent angle will also lock to pre-
vent changes in speed from altering the profile.
•Ifselected,theverticalspeedrequired(VSR)
readoutonthedefaultNAVandmappageswill
show the desired vertical speed to maintain the
proper descent angle. MaximumVSRthatcanbe
displayedis-6000ft/min.IfVSRexceeds-6000
ft/min, dashes will be displayed.
•CoursereversalsarenotincludedintheVNAV
calculations until the aircraft begins the course
reversal.Whilereversingcourse,VNAVincludes
direct-to the course reversal wayopint in the
VNAVcalculation.
•At500feetabovethetargetaltitude,an
“Approaching Target Altitude” message is pro-
vided.TheVSRreadoutonthedefaultNAVand
map pages is blanked out, at this point.
Verticalnavigationmessagescanbeturnedonor
off. (By default the messages are off.) Turning the mes-
sages off allows you to keep the profile settings you’ve
entered previously, without having them generate mes-
sages when the feature isn’t needed.
To disable/enable the vertical navigation (VNAV)
messages:
1. Press MENU to display the vertical navigation
page options menu.
2. With “VNAV Messages On?” highlighted, press
ENT. Or, if the messages are already on and you
wish to turn them off, make sure “VNAV Mes-
sages Off?” is highlighted and press ENT.
To restore the factory default VNAV settings:
1. On the Nav VNAV page, press the MENU
key.
2. Turn the large right knob to highlight
“Restore Defaults” and then press ENT.
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