On Thursday, January 24, 2019 at 7:56:30 PM UTC-8, wrote:
Hi all,

Sorry to start yet another ADS-B discussion, but I'm wondering about the value of it to a glider that doesn't fly in airspace that requires it. I have a Mode S transponder, so I believe I will continue to be 'visible' to both ATC and TCAS systems. (I am flying through some areas that are commonly used as approach corridors for a Bravo airpspace.)

ADS-B is supposed to increase the precision and allow ATC to route more aircraft in the same space. Am I wrong in thinking that it could be more advantageous to have only Mode S, and perhaps be given a bit more separation from inbound heavies?

Thanks,
-Greg

Thanks all, great info. I do have a TT22, but a certified glider, so I would need the more expensive GPS.

And I have spoken with ATC and they've seen my N-Number form just the TT22 mode S. Most recently, they called positive radar contact without asking for an ident or squawk.

I was under the impression that ADS-B in aircraft would see a mode S transponder as PowerFlarm does. If that's really not the case, that's probably reason enough to spring for the GPS.

And lastly, PowerFlarm sees ModeS transponders, is there really a class of ADS-B out traffice that PowerFlarm doesn't see?