Garmin GNS 430 - Manual (Page 54)

46
The satellite status page also indicates the accuracy of the position fi x, using Esti-
mated Position Error (EPE), Dilution of Precision (DOP), and Horizontal Uncertainty
Level (HUL) fi gures. DOP measures satellite geometry quality (i.e., number of satel-
lites received and where they are relative to each other) on a scale from one to ten. The
lowest numbers are the best accuracy and the highest numbers are the worst. EPE uses
DOP and other factors to calculate a horizontal position error, in feet or meters. HUL is
explained in Section 10 on page 163.
Vertical Navigation Page
The GNS 430’s vertical navigation page (the last NAV page) allows you to create a
three-dimensional profi le which guides you from your present position and altitude to a
fi nal (target) altitude at a specifi ed location. This is helpful when you’d like to descend to a
certain altitude near an airport or climb to an altitude before reaching a route or direct-to
waypoint. Once the profi le is defi ned, message alerts and additional data on the default
NAV and map pages will keep you informed of your progress.
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.
NAV PAGES
Vertical Navigation
(VNAV)
2
Altitude Reference
(AGL or MSL) Target Altitude
Target
Distance
Sixth Page
in NAV group
Vertical Speed
Desired
Target Reference
Vertical Speed
Required
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