I have a Garmin G3X Touch (GDU 460) and GTN 625. Although it used to work correctly, I can no longer select External GPS to use the GTN for navigation - it just doesn?t show ?External? anymore as an option anywhere on the G3X. I updated the GTN Nav database in case it was too far out of date, and updated all the G3X databases, but still no luck. I am using GTN version 6.21 (and 5.2 for GPS/WAAS) and G3X version 8.61. Any ideas on what I should check next? Thanks!