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.
Failure of the tail rotor system support bracket during landing.
the CFI's failure to follow procedures and directives, and the use of an improper technique to transition from an autorotative descent to a hover, which exceeded the aircraft's performance capabilities and resulted in a unplanned hard landing. The soft terrain was a factor in the nose over and rollover.