Serial Port 1, Garmin Data Transfer, Main Menu, Tools, Data Link., GDL 39/GDL 39R Interface Setup - firmware | Garmin aera 660 | aera 660 Pilot s Guide (Page 159)
Database Purchase, Installation, and Updates, Purchasing/downloading/installing databases | Garmin aera 660 | aera 660 Pilot s Guide (Page 146)