Mode S is just a fancier Mode C transponder.
It transmits a unique ICAO address and altitude.
There are extended Mode S messages, which transmit ADS-B information, but not every Mode S transponder is designed to do that.
So a plane with ADS-B capability will also transmit the normal Mode S signals, but also broadcast position.
It transmits a unique ICAO address and altitude.
There are extended Mode S messages, which transmit ADS-B information, but not every Mode S transponder is designed to do that.
So a plane with ADS-B capability will also transmit the normal Mode S signals, but also broadcast position.
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