Skin diving in Mentor waters shall be confined to within a distance of 50 feet from the shore or pier not within any channel or passageway ordinarily used by watercraft. Skin diving and scuba diving may be permitted in other areas when such diver is accompanied by an occupied watercraft and the area in which he is diving is marked by adequately displayed diver's flag. It shall be the duty of the operator of the watercraft to yield right-of-way to skin and scuba divers and not to approach to within 200 feet of such diver's flag. It shall be a violation for such diver to surface further than 50 feet from such diver's flag. The diver's flag referred to shall be such as described in Section 381.01. (1969 Code 79.15)