Originally Posted by
peekay4
If these RJ85s are really transmitting at NUCp 0 data quality level as Dave says then forget about trying to match positions. NUCp 0 means the position error could be greater than 10 nm.
I think Dave is saying that the NUCp is set to zero because the RJ85 ADS-B installation is not compliant with the local regulations even though its accuracy may be much better than 10 nm.
For example, in Australia:
It is critical that aircraft only transmit ADS-B from approved equipment configurations. Transmissions from unapproved equipment configurations could mislead aircraft with ADS-B IN capabilities and could also mislead ATC.
It is the responsibility of aircraft owners and operators to ensure that their aircraft comply with the related CASA regulations.
The relevant CASA regulations have been in place for some years, and say :
“If an aircraft carries ADS-B transmitting equipment which does not comply with an approved equipment configuration, the aircraft must not fly in Australian territory unless the equipment is
(a) deactivated; or
(b) set to transmit only a value of zero for the NUCp or NIC.”
Mandate to deactivate some ADS-B transmissions | Airservices