West Virginia law requires that skin divers and scuba divers display a diver-down flag to mark their diving area. Divers must stay within a 100-foot radius of the flag. Motorized vessels must remain at least 100 feet away from the flag. Two types of flags are used to indicate diving activity.
A rectangular red flag, at least 10 inches on any side, with at least a 1½-inch, white diagonal stripe running from upper left to lower right is required on state waters.
A blue and white International Code Flag A (or Alfa flag), at least 3.3 feet (one meter) high and visible from all directions, must be displayed on vessels whenever these vessels are restricted in their ability to maneuver by the diving operation. This flag indicates that the vessel is involved in a diving activity.