General Database Information; Database Versions; Database Updates - Garmin GNC 420W Pilot's Manual Addendum

Part Three: Section 2
TAWS Operation

General Database Information

Garmin TAWS uses terrain and obstacle informa-
tion supplied by government sources. The data under-
goes verification by Garmin to confirm accuracy of
the content, per TSO-C151b. However, the displayed
information should never be understood as being
all-inclusive. Pilots must familiarize themselves
with the appropriate charts for safe flight.
NOTE: The data contained in the terrain and obstacle
databases comes from government agencies. Garmin accu-
rately processes and cross-validates the data, but cannot
guarantee the accuracy and completeness of the data.
The terrain/obstacle databases are contained on a
datacard which is inserted in the right-most slot of the
400W/500W Series units.

Database Versions

The version and area of coverage of each ter-
rain/obstacle database is shown on the Terrain Data-
base Versions Page, located in the AUX Page Group.
Databases are checked for integrity at power-up. If a
database is found to be missing and/or deficient, the
TAWS system fails the self-test and displays the TAWS
system failure message.
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Terrain Database Information

Database Updates

Terrain/obstacle databases are updated periodi-
cally with the latest terrain and obstacle data. Visit the
Garmin website to check for newer versions of terrain/
obstacle databases. Compare database cycle numbers
to determine if a newer version is available.
The database update process includes either
reprogramming or replacing the database card and
inserting the updated card in the right card slot on the
unit front panel. The terrain/obstacle database may
be downloaded via the intenet and the card repro-
grammed using a USB programmer available from
Garmin. Contact Garmin at 800-800-1020 or at
www.garmin.com for more information.