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CAUTION
The Apollo GX and the U.S. GPS Satellites
use the World Geodetic System 1984
(WGS-84) horizontal datum for latitudes
and longitudes. Approach plate or approach
procedure data must be referenced to the
WGS-84 or North American Datum 1983
(NAD-83) in order to use the approach.
NAD-83 is for all practical purposes
identical to the WGS-84 datum. All
published U.S. and Canadian approach
charts meet this criterion. Prior to using the
Apollo GX for any GPS approach other
than a published U.S. or Canadian
approach, you must first verify that the
approach charts and approach waypoints
use the WGS-84 or NAD-83 reference
system. If the approach data is referenced to
any other coordinate system, it can result in
an unsafe position error.
The Apollo GX database contains approach
information. It is very important that the
pilot verify that approach data is current
prior to use. The approach data contained
in the Apollo GX does not replace or
eliminate the need for Approach Plates or
published Approach Procedures.
Some approach procedures may not be
suitable for the Apollo GX operational
characteristics and may be omitted from the
Apollo GX database. Since an approach
must be in the database in order to be
selected and flown using the Apollo GX, it
is good pre-flight practice to make sure that
the database contains anticipated
approaches. Always refer to the charts for a
given approach before performing the
approach.
9-3
Approach Basics (GX50/60)
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