On Thursday, May 28, 2015 at 10:26:08 AM UTC-5, wrote:

I would hope that glider pilots choose to install a transponder BEFORE they add a FLARM to their aircraft.

I would hope that glider pilots choose to install a PowerFLARM BEFORE they add a transponder to their aircraft, unless they routinely fly in airspace with lots of airliners (TCAS-equipped).

Why? Because with a PowerFLARM, the glider pilot can actively avoid transponder and ADS-B (mode S-ES) equipped aircraft, as well as other PF-equipped gliders that are likely to join him in a thermal. With only a transponder, your protection is entirely up to the OTHER aircraft, and in the case of most VFR traffic, will provide almost NO protection.

Of course, the best solution is to have both a transponder and PF....

Kirk