190-01004-02
GTN 625/635/650 TSO Installation Manual
Rev. F
Page 1-33
1.6.7 Obstacle Database
The Obstacle database provides identification of known obstacles greater than 200 feet AGL. This
database is also used with Terrain awareness and TAWS/HTAWS functionality. The data conversion
process is performed using software that is developed and maintained under Garmin configuration
management according to RTCA/DO-200A, Level 2, Standards for Processing Aeronautical Data.
The Obstacle database is updated by removing the database card from the GTN, updating the database on
the card and reinserting the card. The Obstacle database can be downloaded via the internet and the card
programmed using an SD card reader. Contact Garmin at 866-739-5687 or go to
flyGarmin.com
for more
information or instructions.
1.7 Fault Detection and Exclusion (FDE)
The GTN, when installed as defined in this manual, complies with the requirements for GPS/SBAS
primary means of navigation in oceanic and remote airspace when used in conjunction with the provided
FDE prediction program.
The GTN includes internal Fault Detection and Exclusion (FDE) software which is active for all flight
phases including oceanic and remote operations, en route and terminal, and precision and non-precision
approaches. FDE does not require any pilot interaction. The FDE consists of two parts:
The fault detection function detects a satellite failure that can affect navigation; and
The exclusion function is the capability to exclude one or more failed satellites and prevent them
from affecting navigation.
The FDE Prediction program is used to predict FDE availability. This program must be used prior to all
oceanic or remote area flights for all operators using the GTN as a primary means of navigation under FAR
parts 91, 121, 125, and 135. The FDE program is part of the GTN Trainer, available for download from the
GTN product information page on Garmin’s website,
www.garmin.com
.
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