Vertical Navigation Page - Garmin GPS 400W Pilot's Manual & Reference

2 - NAV PAGES
Satellite Status Page
• 3D Navigation —
The GPS receiver is in 3D navigation mode and
computes altitude using satellite data.
• 3D Differential Navigation— The GPS receiver is
in 3D navigation mode and differential corrections
are being used.
The Satellite Status Page also indicates the accu-
racy of the position fix, using Horizontal Figure of
Merit (HFOM), Vertical Figure of Merit (VFOM), and
Estimated Position Uncertainty (EPU). HFOM and
VFOM represent the 95% confidence levels in hori-
zontal and vertical accuracy. The lowest numbers are
the best accuracy and the highest numbers are worse.
EPU is the horizontal position error estimated by the
Fault Detection and Exclusion (FDE) algorithm, in feet
or meters.
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Vertical Navigation Page

The 400W-series vertical navigation page (the last
NAV page) allows you to create a three-dimensional
profile which guides you from your present position
and altitude to a final (target) altitude at a specified
location. This is helpful when you'd like to descend
to a certain altitude near an airport. Once the profile
is defined, message alerts and additional data on the
default NAV and map pages will keep you informed of
your progress.
Target Target
Altitude Distance
NOTE: To use the vertical navigation features, your
ground speed must be greater than 35 knots and
you must be navigating to a direct-to destination
or using a flight plan, and not be in SUSP mode.
190-00356-00 Rev B
Altitude Reference
(AGL or MSL)
Target Reference
Vertical Speed
Required
Page location in
NAV group
Vertical Speed
Desired