On Saturday, January 31, 2015 at 7:23:22 PM UTC-5, Mike Schumann wrote:
There is nothing inherent in FLARM that makes it superior
to ADS-B in terms of its capability to detect potential glider
to glider collisions. Both technologies transmit the aircraft
location once per second. The resolution of both is limited by
the accuracy of the GPS source. What currently makes FLARM
superior are the collision detection algorithms in the receiver,
which are specifically designed for a glider environment.
There is nothing preventing software developers from developing
similar solutions for use with ADS-B receivers.

The above is utter nonsense.
FLARM transmits the PROJECTED PATH of the aircraft using knowledge
of aircraft type and maneuvering.
ADS-B cannot possibly ever match the collision-avoidance performance
of FLARM for gliders, for this and numerous other reasons.

For anybody interested in actual FACTS as opposed
to authoratively-spoken nonsense on RAS, please see:
http://www.gliderpilot.org/Flarm-WhatDoesItDo

Good Grief...