On Friday, July 4, 2014 2:53:41 AM UTC-4, Darryl Ramm wrote:
The situation for experiential aircraft, including gliders, is a bit different. You should be able to do an install with a non TSO-compliant GPS source.

It may be legal to install a non-TSO GPS source in 'experimental' but would there be ANY benefit? From what I read in the link provided by Darryl, the output of un-certified transmitters is ignored.

Darryl wrote:

BTW I just noticed the FAA promoting this ADS-B install information on Facebook. Worth a read for folks interested. http://www.aea.net/ads-b/pdf/FAA_ADSB_06172014.pdf

Excerpt from this FAQ:

Air traffic control does not use data from these
uncertified transmitters, which prevents controllers
from providing flight following services or
separation services to aircraft that are so equipped.
Data from uncertified transmitters are not displayed
on certified ADS-B In displays, and pilots in aircraft
with certified ADS-B equipment will not be able to
see aircraft equipped with uncertified transmitters.