I understand that transponders use secondary radar and ADS-B uses GPS position, which is more accurate. But I don’t understand why both are required. On ATC’s radar, do they see your position given from your transponder or from ADS-B?
I understand that transponders use secondary radar and ADS-B uses GPS position, which is more accurate. But I don’t understand why both are required. On ATC’s radar, do they see your position given from your transponder or from ADS-B?
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