Boating in rough water is rarely fun, but it need not be dangerous or painful. First, know your own limits, and those of your boat. A big, deep, V-hull boat with a tall transom and automatic bilge pumps can take on some pretty scary water and still bring you home. On the other hand, a low-freeboard, heavy-in-the-hams bass rig that's a real bullet in a 1-foot chop may stuff its nose, do a somersault and sink in 4-foot waves. When in doubt, sit it out.