Rule 28 Vessels Constrained by their Draught

Vessels Constrained by their Draught — International

(a) A vessel constrained by her draught may, in addition to the lights prescribed for power-driven vessels in Rule 23, exhibit where they can best be seen three all-round red lights in a vertical line, or a cylinder.

Vessels Constrained by their Draught — Canadian Modification

(b) Notwithstanding paragraph (a), in the Canadian waters of a roadstead, harbour, river, lake or inland waterway, no vessel shall exhibit three all-round red lights in a vertical line or a cylinder.