Don't take anything I say for gospel, but I was just reading up on the new version 12 software upgrade (free) for the Dynon Skyview system. They are in process of also upgrading their software (also free) for their mode S transponder package that interfaces with the Skyview WAAS GPS. It kind of sounded like that upgrade will make the Dynon transponder compatible with the 2020 ADS-B out mandate. The only other piece of the puzzle is an acceptable WAAS enabled GPS to talk to the transponder. Until now, this GPS had to be a TSO'd unit which the Skyview GPS is not. But if Tom Waid's information is true, then the Skyview GPS should be compatible with the mandate, since it already talks to the transponder and is a high quality WAAS unit. So maybe those of us with the Skyview system and mode S transponder will be able to skate into the 2020 ADS-B out mandate for no extra bucks. Woo-Hoo! I hope I am not all wet on this.