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 am not aware of any ADS-B *Out* product priced at about $1,500 with or
without being portable or with or without a built-in "WAAS GPS".

I suspect you are confusing this ADS-B Out and ADS-B In. Portable ADS-B
*In* receivers typically include a consumer grade WAAS chipset to locate
the aircraft's own position on weather and traffic displays and to provide
location/navigation data for external PDA/PNA/tablet navigation software.

ADS-B Out in gliders and towplane provides little value over other options
that are actually available, installable and well understood today. If you
want glider-glider and glider-towplane collision avoidance technology
install a PowerFLARM. If you are concerned about other traffic, PowerFLARM
PCAS and ADS-B 1090ES In can help, as can installing a transponder...
especially if the concern is fast jets and airliners.

If you operate under a Class B shelf your towplane will already have a
transponder, and unfortunately will also be required to equip with ADS-B
Out by January 2020. If not already equipped with one you should look at a
Mode-S 1090ES Out compatible transponder like a Trig TT-22. UAT Out devices
would be a very bad idea in a towplane as they won't be seen on a
PowerFLARM.