On Monday, August 3, 2015 at 2:42:30 PM UTC-7, Dave Nadler wrote:
On Monday, August 3, 2015 at 3:53:38 PM UTC-4, Darryl Ramm wrote:
... I expect the best that would happen there is that
TABS Class B GPS device manufacturers, and maybe others,
will produce even lower cost "non-TSO" TABS GPS sources.

For example, probably:
http://newsroom.garmin.com/press-rel...w-capabilities

... The GPS 20A, GA 35 WAAS antenna and install kit is available for $1,225*
... anticipated to become available Q3 2015.
... For additional information, visit: www.garmin.com/experimental.

And that Garmin GPS 20A box is already meeting more than the TABS requirement... but because it meets the FAA ADS-B Out mandate requirement it should also be usable with TABS Class A devices. Exact device compatibility would need to be checked and is somethign potentially that TABS installation/use regulations may address (as regulations did by requiring only specific installs of confirmed compatible (via an earlier STC process) of ADS-B Out and GPS devices). Ultimately I expect if TABS takes off pure TABS boxes will mostly end up being integrated Class A and B devices... with some standard Mode S/1090ES out transponders used for TABS compatibility maybe with TABS specific GPS sources.

I think what strategically happens for TABS, for better or worse, is in the hands of large potential drone operators and manufacturers and their lobbyists.