On Wednesday, July 18, 2018 at 8:07:37 AM UTC-7, jfitch wrote:
[snip]
Powerflarm absolutely outputs ADSB 1090ES contacts. Whether your display shows them is up to it. Mine does. It does NOT display the funky USA only UAT contacts (unless they are rebroadcast as 1090ES).


Ah last sentence there is not correct. The PowerFLARM does not receive ADS-R data, so even if a UAT-Out target is rebroadcast you will not see it via a PowerFLARM. What display you use is irrelevent.

And this applies wether you have ADS-B Out (including TABS) to make your glider an ADS-B ground services client or that ADS-R service is being provided for some other nearby aircraft. The PowerFLARM just does not understand ADS-R messages.