Genghis the Engineer is making a lot of sense.
Before some of you jump on the high horses and gallop for his throat - get real. It takes 2 to collide. Anything that the no-engine brigade can do to improve the situational awareness vs other traffic is a huge advance over the oft blinkered "I'm in a glider so you have to avoid me" attitude.
You are right - I do have to avoid you. Now tell me how? Literally - tell me. get a radio fitted and use it. Get a FIS if you can, fit a transponder (if you can), get a Lunerberg lens fitted (they really do work). Stay the hell away from controlled airspace, airfield climb-out and approach lanes, MATZs etc etc.
Just like any airspace user - play your part in keeping it safe for all of us
Now count to 10, take a deep breath and really let me have it!