Garmin GPS 400W,GNC 420W Pilot's Manual & Reference page 68

2 - NAV PAGES
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 Profile"
occurs. The descent angle will also lock to pre-
vent changes in speed from altering the profile.
• If selected, the vertical speed required (VSR) read-
out on the default NAV and map pages will show
the desired vertical speed to maintain the proper
descent angle.
• 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.
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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 Messages Off?" is highlighted and
press ENT.
To restore the factory default VNAV settings:
On the Nav VNAV page, press the MENU
1.
key.
2. Turn the large right knob to highlight
"Restore Defaults" and then press ENT.