I've been waiting for this one because it maps custom holding patterns at any waypoint. Makes enroute holding patterns simple. Many other features, too. My Avionics Shop (San Luis Avionics) doesn't have it yet, but should by end of week.
Service Bulletin: SB1580 GTN 6XX/7XX Software Upgrade to Main Software Version 6.11 and GMA 35 Audio Software Version 4.10A/4.1
Service Bulletin: SB1580 GTN 6XX/7XX Software Upgrade to Main Software Version 6.11 and GMA 35 Audio Software Version 4.10A/4.1