Is Ads-B Out Required With The Gts Traffic System - Garmin GTS 820 TAS Pilot's Manual

7.6 Is ADS-B Out required with the GTS Traffic
System?
No. The ADS-B In feature uses ADS-B, ADS-R, and TIS-B, but the ownship is
not required to be equipped with ADS-B Out.
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190-00587-02 Rev. E Garmin GTS Traffic Systems