Coverage depends on ground receiver reception and is not a complete picture of traffic.
The hex code is the aircraft's ICAO 24-bit address, broadcast by its ADS-B transponder. It is the key used to match live position reports to this registration.
The student pilot's improper flare and recovery from a bounced landing.
The student pilot's improper landing flare and the CFI's inadequate supervision resulting in a hard landing and damage to the airplane.
Failure of the student pilot of N864CP to judge the clearance between his airplane and the stationary N431ER while taxiing for takeoff which resulted in a ground collision.