Dutch transponders?
Was it a few months ago that Dutch pilots reported that when things got really busy on a good soaring day, ATC asked everyone please switch off your transponders, guys, we can't cope with that density of blips!
Nobody on this thread has said a word about looking out. All keen to install the latest technology, a moving map, a radio with ATC to keep you from harm. How about a little statue of St.Christopher fitted over the Brunswick tube?
The only important instrument for avoiding traffic in the glider is the basic GPS that helps one avoid airspace infringements. And the audible vario.
Otherwise, keep looking OUTSIDE the cockpit, please.