Further to that I'd suggest that glider jockeys take a look at the charts just as we do. I saw the glider field on the chart near my track, but did you guys see the Victor airway 5 miles from your field? I encountered a glider thermalling in the centreline just ahead of me, I was able to avoid him but what about the faster guys flying IFR not much higher up? I know they have to maintain a lookout in VMC regardless of the flight rules they're using, but assuming the other fella sees you can be fatal.