What about a crane that uses outriggers to level the crane? How level must the ground be where the outrigger floats are positioned? Applying the 1-percent rule requires, for example, a 24-inch diameter outrigger float to be level to within ¼-inch. The main point is the outrigger floats must be perpendicular to the outrigger jacks and the floats must also be level within 1-percent.