The new GTX 335/345 is the same size as Garmin’s popular GTX 327/330 Mode C transponders. Perhaps the biggest news is for G1000-equipped aircraft: remote versions of each box (GTX 335R and 345R) are available, and will be approved for installation on a number of models. Garmin Introduces GTX 335D and GTX 345D ADS-B Diversity Transponders March 26, 2019 We are excited to introduce the GTX 335D and GTX 345D, two diversity transponders that provide optimal Automatic Dependent Surveillance-Broadcast (ADS-B) Out coverage and visibility while operating throughout the global airspace system. Page 1 GTX 335/345 Series All-In-One ADS-B Transponder Pilot's Guide...; Page 2 Garmin. Garmin hereby grants permission to download a single copy of this manual and of any revision to this manual onto a hard drive or other electronic storage medium to be viewed for personal use, provided that such electronic or printed copy of this manual or revision must contain the complete text of this ... New AML STC Brings Installation Approval to 60+ Rotorcraft Models Garmin is pleased to announce a new Part 27 AML STC for the GTX 345/335 series is now available.