The remaining RJ85s that CityJet didn't sell to LAMIA regularly fly around the UK sending an ADS-B NUCp of 0.
Does that mean that over here we have departed from the planet without anyone noticing, or that we've torn up the rule book ?
If NUCp of 0 is actually accepted then yes, you have departed from the planet.
NUCp zero means the ADS-B data is invalid,
and any position information should be discarded.