GTN Version 6.51 Update
Garmin Releases Mandatory Update Version 6.51 for GTN Navigators
On November 12, 2018, Garmin released a mandatory service bulletin for GTN navigators running version 6.00 or newer. This bulletin addresses a major issue with any aircraft interfaced to a GDL 69, GDL 88 or GTX 345/45 transponder. Prior to this update, users may experience their GTN screen to go blank for a few seconds when displaying FIS-B NEXRAD information and also can experience a delay in FIS-B refresh on the map page. Despite the update being mandatory, Garmin will not be covering the update labor under warranty.