I usually tell my buddy to make a nice easy ascent by holding my hand palm down and flat and move my hand at a 20-40 degree angle, forward and up in the direction we should go. Kind of like describing an airplane taking off with your hand. If we need to ascend without forward movement, I hold my hand out flat, palm down fingers spread wide, and rotate my wrist a little (kind of like describing an airplane that feels like it's flying on a ball-bearing or a skydiver flying like a potato chip) while moving it up slowly. They're both one handed, and the students I used it on picked up it's meaning immediately. I use these because, although I am not tech trained yet, I have read the books and noted that the "thumbs up" signal means "That's it, it's over, head up now" and demands the signal be returned and complied with immediately. Just my .02 worth. Semper Fi, Dave