In Britain - where cloud flying is common - you radio your position
and intentions on a set frequency before entering a cloud. (You're
also required to be wearing a parachute.)

As an aside older British gliders were required to have speed-limiting
airbrakes, so if it all went pear-shaped you could open the airbrakes
and eventually fall out the bottom of the cloud at a reasonable
airspeed. My understanding is that more modern gliders have airbrakes
that only limit the speed in a 45deg dive.


Dan