ORIGINAL: Len in Maryland
A draw check bow is ONLY useful if you have an established form, and if that form is GOOD form. Other than that, the DC bow can be VERY misleading.
The Wingspan method is actually the best way to get close.
LOL, I've seen guys with wingspans around 70", shove the bow arm out as far as possible, then draw back far enough to hook the string over their ear and then claim, "yep, 32" drawlength!".