All the other advice given in this thread is why glider pilots don't trust power pilots to be keeping a decent lookout. The emphasis is on the gadgets rather than the mark one eyeball.
Not
quite all, I did say:
Faff around with CRP-1 and rulers and pens and arithmetic in the air? No ta, I'd rather do my spiral dive recoveries when I'm expecting them. Besides, there's too many gliders around to spend that much time not looking out the window.