Our club is near a Class C airport. In fact there is a notch in the Class C
airspace, so that it is not above our airport. The top of the Class C
airspace is 10,200' MSL. We shouldn't need transponders because we are 1)
exempt as gliders and 2) above 10,000 MSL when above the Class C. Is the
suggestion here that we should contact Approach when we intend to overfly
the Class C?

John Scott