GNS 430 Pilot’s Guide and Reference
iv
WARNINGS,
CAUTIONS, AND NOTES
WARNING:
Navigation and terrain separation must NOT be predicated upon the use of the TERRAIN function.
The TERRAIN feature is NOT intended to be used as a primary reference for terrain avoidance and does not
relieve the pilot from the responsibility of being aware of surroundings during flight. The TERRAIN feature is
only to be used as an aid for terrain avoidance and is not certified for use in applications requiring a certified
terrain awareness system. Terrain data is obtained from third party sources. Garmin is not able to independently
verify the accuracy of the terrain data.
WARNING:
The terrain data should be used only as an aid for situational awareness. Terrain data must not
be used as the sole basis for decisions or maneuvers to avoid terrain or obstacles. Terrain data must not be
used for navigation.
WARNING:
The altitude calculated by GNS 430 GPS receivers is geometric height above Mean Sea Level and
could vary significantly from the altitude displayed by pressure altimeters in aircraft. GPS altitude should never
be used for vertical navigation. Always use pressure altitude displayed by pressure altimeters in the aircraft.
WARNING:
The Jeppesen database used in the GNS 430 system must be updated regularly in order to ensure
that its information remains current. Updates are released every 28 days. A database information packet is
included in the GNS 430 package. Pilots using an outdated database do so entirely at their own risk.
WARNING:
The basemap (land and water data) must not be used for navigation, but rather only for non-
navigational situational awareness. Any basemap indication should be compared with other navigation
sources.
WARNING:
For safety reasons, GNS 430 operational procedures must be learned on the ground.
WARNING:
The United States government operates the Global Positioning System and is solely responsible
for its accuracy and maintenance. The GPS system is subject to changes which could affect the accuracy and
performance of all GPS equipment. GPS accuracy may be degraded by the U.S. Department of Defense-imposed
Selective Availability (SA) program. With ‘SA’ on, GPS altitude may be in error by several hundred feet. Portions
of the Garmin GNS 430 utilize GPS as a precision electronic NAVigation AID (NAVAID). Therefore, as with all
NAVAIDs, information presented by the GNS 430 can be misused or misinterpreted and, therefore, become
unsafe.
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