On Tuesday, February 10, 2015 at 12:20:37 PM UTC-8, Bill T wrote:
I believe that the GPS reciever still needs to be WAAS compliant to provide ADSB out data. The key would be to approve portable ADSB out devices, currently available for about $1500 with WAAS GPS built in, for use in glider tow and gliders. It sure would save out club a heap of $$$ for the tow plane, we are under the class b shelf.

BillT

I thought most GPS units installed in gliders (at least in the last few years) were WAAS compliant.