Will FLARM see all ADS-B Out-equipped aircraft?

PowerFLARM devices with an integrated 1090 MHz receiver will process all ADS-B Out (1090ES) messages, irrespective of the SIL, SDA, NIC, etc. parameters. The collision warning algorithm then calculates a collision risk and issues warnings based on the available data. This also takes into account the fact that ADS-B Out normally has lower accuracy than FLARM, e.g. by assigning higher margins.

In the US, PowerFLARM Fusion (and PowerFLARM Core with an optional feature license) can also receive ADS-R, i.e. UAT Out-equipped aircraft (see this page for limitations), also irrespective of the quality parameters. TIS-B can be received as well, but TIS-B traffic (transponder-only aircraft) have significantly lower accuracy.