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Why do,we still need transponders with ADSB?

Please explain to me why Mode C transponders are still necessary if ADSB is more accurate than radar?

The FAA runs the airspace for the airlines. The airlines use a transponder-based detection system as a collision avoidance system. They want to keep this system as a backup to ADSB based collision avoidance.
 
The WORLD uses a transponder-based detection system. We are part of the world, not separate from it.

:cool:
 
Why Squawk Code

Sort of a related thought question: With ADS-B out transmitting your tail number (or flight ID), thus uniquely identifying you, why is it necessary to squawk a 4 digit code? Seems ATC should already have a unique identifier for your "target" already.
 
Sort of a related thought question: With ADS-B out transmitting your tail number (or flight ID), thus uniquely identifying you, why is it necessary to squawk a 4 digit code? Seems ATC should already have a unique identifier for your "target" already.

If every aircraft was operating with ADSB that might actually work. Right now even with ADSB giving them a tail number for the airplane, that doesn't tell ATC if you are receiving services or not - you could be VFR and not talking to anyone - but if you a squawking a discrete code they know you are in the system and receiving services, either VFR or IFR.
 
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