Introduction
Warnings and Cautions
WARNING: Terrain data is obtained from third party sources. Garmin is not able to independently verify the accuracy of this
data which should be used only as an aid for situational awareness. Terrain data must not be used as the sole basis for deci-
sions or maneuvers to avoid terrain or obstacles. Terrain data must not be used for navigation.
CAUTION: Use the 400W/500W Series Units at your own risk. To reduce the risk of unsafe operation, carefully review and
understand all aspects of the Owner's Manual and the Flight Manual Supplement, and thoroughly practice basic operation
prior to actual use.
CAUTION: The Global Positioning System is operated by the United States government, which is solely responsible for its
accuracy and maintenance. The system is subject to changes which could affect the accuracy and performance of all GPS
equipment. Although Garmin 400W/500W Series Units are precision electronic NAVigation AIDS (NAVAID), any NAVAID can be
misused or misinterpreted and therefore become unsafe.
CAUTION: Use the Weather Data Link Interface, TIS, TAWS, and TERRAIN at your own risk. To reduce the risk of unsafe opera-
tion, thoroughly practice basic operation prior to actual use. When in actual use, carefully compare indications from the
Garmin unit to all available navigation sources, including the information from other NAVAIDS, visual sightings, charts, etc.
For safety, always resolve any discrepancies before continuing navigation. The GPS altitude format calculated by the Garmin
400W/500W Series units is geometric height above mean sea level and could vary significantly from altitude displayed by pres-
sure altimeters in aircraft. Never use GPS altitude to determine aircraft altitude.
CAUTION: The Jeppesen database incorporated in the Garmin 400W/500W Series Units must be updated regularly in order to
ensure that its information is current. Updates are released every 28 days. A database information packet is included in your
Garmin 400W/500W Series Unit package. Pilots using an out-of-date database do so entirely at their own risk.
CAUTION: The Weather Data Link, TIS, TAWS, and TERRAIN information contained in this Pilot's Guide Addendum is not
intended to replace the documentation that is supplied with the applicable Garmin 400W/500W Series Unit and the GTX 330
Transponder. The user must know how to operate the 400W/500W Series Unit and be knowledgeable of the information in the
400W/500W Pilot's Guide.
TIS CAUTION: TIS is NOT intended to be used as a collision avoidance system and does not relieve pilot responsibility to "see
and avoid" other aircraft. TIS should not be used for avoidance maneuvers during IMC or other times when there is no visual
contact with the intruder aircraft. TIS is intended only to assist in visual acquisition of other aircraft in VMC. Avoidance maneu-
vers are not recommended, nor authorized, as a direct result of a TIS intruder display or TIS alert.
While TIS is a useful aid to visual traffic avoidance, it has some system limitations that must be fully understood to ensure
proper use. Many of these limitations are inherent in secondary radar surveillance. In other words, the information provided by
TIS will be no better than that provided to ATC.
CAUTION: Garmin would like to remind pilots flying with GDL 69/69A-equipped aircraft that TFRs are only advisory and
are not a replacement for a thorough preflight briefing on TFR times and locations. Always confirm TFR data through official
sources and contact your Flight Service Station for interpretation of TFR data.
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