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[GuppyWN]

THanks . I am confused Dynon says I need to scrap my garmin transponder and upgrade to the mode S?

Check out the Garmin GDL-82. Should work great with your 327.

[Dorsal]

I installed the GDL 82 a couple months ago, works well. One advantage is that it uses the same antenna as the transponder. Needs power, ground and it's GPS antenna, fairly simple install.