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 FAILURE OF THE PILOT-IN-COMMAND TO IDENTIFY UNSAFE SNOW CONDITIONS AT THE SITE. A FACTOR ASSOCIATED WITH THE ACCIDENT IS THE SOFT SNOW IN THE TAKEOFF AREA.
THE FAILURE OF THE PILOTS OF BOTH AIRPLANES TO MAINTAIN AN ADEQUATE VISUAL LOOKOUT. FACTORS WHICH CONTRIBUTED TO THE ACCIDENT WAS THE FAILURE OF THE PILOT OF THE CE-172 TO BECOME AWARE OF AND TO USE THE LISTED FREQUENCY FOR INTER AIRCRAFT COMMUNICATIONS, AND THE REDUCED VISUAL ACUITY OF THE CE-172 AGAINST THE SURROUNDING TERRAIN
THE PILOT'S DECISION TO COMMIT HIMSELF TO A LANDING BEFORE COMPLETING AN EVALUATION OF THE WEATHER IN THE VICINITY OF THE LANDING SITE. CONTRIBUTING TO THE SEVERITY OF THE ACCIDENT WAS THE SNOWBANK OFF THE SIDE OF THE RUNWAY WITH WHICH THE AIRCRAFT COLLIDED.