Confirm the applicable software, installation requirements, and service cost with RWAS
Correction added October 28, 2026: This article previously described version 8.20 as a newly released, free update for all G3X Touch installations. That broad claim and its feature and service-time details have not been verified and should not be used to select or install software.
Certified and experimental software
Garmin maintains separate software listings and update guidance for certificated and experimental aircraft. On October 28, 2026, Garmin’s certificated GDU 4xx-STC display listing showed version 9.18. That listing can change and does not establish the approved version for a particular aircraft.
Installation and documentation
For certificated aircraft, Garmin directs approved avionics installers who can make the required logbook entry to the certified update process. The applicable installation data, software and compatibility must be reviewed for the aircraft and equipment.
Ask the shop
Contact Roger Wilco Aviation Services at (605) 299-8178 to review the installed system, applicable documentation, required verification, scheduling and labor price. A downloadable software file does not establish a free installation or guarantee a 30–45 minute service.