All TAWS-equipped G1000, G950, G900X, GPS 500W, and GNS 530W units are affected.
Non-WAAS equipped GNS 500 Series units are not affected.
Garmin has identified an issue concerning the Terrain Database, whereby TAWS-B Forward Looking Terrain Avoidance (FLTA) alerts are not available when flying over the open ocean/sea (specifically any body of water at sea level). TAWS-B functions properly in all other locations.
Do not use TAWS-B information for primary terrain avoidance. TAWS-B is intended only to enhance situational awareness.
Terrain Database 08T2 is now available on the Garmin website
(http://shop.garmin.com/aviation/databases/). The 08T2 Terrain Database download
will be free of charge until 12/31/08. Refer to the attached Garmin Service Letter ( Download 0816_RevB) for instructions on installing Terrain Database 08T2.
IMMEDIATE ACTION REQUIRED
Until the database update is installed, operators should be aware that FLTA alerts are not available when flying over the open ocean/sea (specifically any body of water at sea level).