Originally Posted by
flyinbob
I don't know why people put such faith in FlightRadar 24. I use it often, and it routinely shows odd data. Planes flying backward, turning 180 degrees and flying that way for 10 minutes or so and then going back to normal, showing 35,000 feet in altitude but 0 on speed. It is a commercial product, more for entertainment than accuracy. So all those things showing this flight from FlightRadar 24 I will take with a BIG grain of salt.
Bingo! FR24 is a spotter/enthusiasts tool and nothing more. It relys on an army of volunteers using amature radio ADS-B receivers. It is incredibly prone to signal interference.
In post #1250 there is
a brief background to ADS-B The navigation integrity category and navigation uncertainty category are somewhat ignored by amature equipment, as is the SPI function and others.