Volatility stop is a very useful indicator which tells us the long-term trend. The blue line of the chart is in up-trend,and the pink line is a down-trend. I also use Gann Square to tell us where the market is. By monitoring July, 2000 & October, 2007, the market dropped quickly in down-wheels, so we need very careful after the market enters next down-wheel. Sell and short when pink line emerges and extends.