If you drive a car you probably rely on its gauges to get you safely from point A to point B. When you’re trading options, and spreads in particular, the Greeks are your gauges. During this presentation I will define and explain the 5 most common Greeks: Delta, Gamma, Theta, Vega and Rho. I’ll also provide some examples of how they can help you forecast the value of your position. In addition, I’ll explain some of the their limitations and show how using them incorrectly can lead to erroneous results.