* Approved refers to antennas listed in the applicable Installation Manual (Table 2) that allow the Garmin WAAS enabled
unit with GPS software v3.XX or later to meet the TSO-C145a/C146a or TSO-C145c/C146c requirements without requiring
the operational limitations specified in the applicable Installation Manual. Unapproved refers to antennas listed in the
applicable Installation Manual (Table 2) that allow the Garmin WAAS enabled unit (regardless of GPS Software version) to
meet the TSO-C145a/C146a or TSO-C145c/C146c requirements with the operational limitations specified in the applicable
Installation Manual.
Document Name Document Number
GIA 63/GIA 63W Installation Manual 190-00303-05
400W Series Installation Manual 190-00356-02
500W Series Installation Manual 190-00357-02
GNS 480 (CNX80) Installation Manual 560-0982-01
GTN 6XX/7XX AML STC Installation Manual 190-01007-A3
GTN 625/635/650 TSO Installation Manual 190-01004-02
GTN 725/750 TSO Installation Manual 190-01007-02
Table 2
1.3 DETERMINING WHEN A WFDE PREDICTION IS REQUIRED FOR GTN PRODUCTS
For the GTN 6XX/7XX series, a WFDE Prediction is only required in the following circumstances:
• An FDE prediction is required for operations where the route requires Class II Navigation (e.g. Oceanic/Remote
operation) and GPS is to be the primary source of navigation per FAA AC 20-138A Appendix 1.
• A RAIM prediction is required for operations in areas where SBAS coverage is not available.
