Rule 13 Overtaking

Overtaking — International

(a) Notwithstanding anything contained in the Rules of Part B, Sections I and II, any vessel overtaking any other vessel shall keep out of the way of the vessel being overtaken.

(b) A vessel shall be deemed to be overtaking when coming up with another vessel from a direction more than 22.5 degrees abaft her beam, that is, in such a position with reference to the vessel she is overtaking, that at night she would be able to see only the sternlight of that vessel but neither of her sidelights.

(c) When a vessel is in any doubt as to whether she is overtaking another, she shall assume that this is the case and act accordingly.

(d) Any subsequent alteration of the bearing between the two vessels shall not make the overtaking vessel a crossing vessel within the meaning of these Rules or relieve her of the duty of keeping clear of the overtaken vessel until she is finally past and clear.

Overtaking — Canadian Modification

(e) Notwithstanding paragraph (b), in the waters of the Great Lakes Basin, a vessel shall be deemed to be overtaking if approaching another vessel from a direction more than 22.5° abaft her beam, that is, in such a position with reference to the vessel she is overtaking that at night she would not be able to see either of the sidelights of the other vessel but would be able to see

(i) the sternlight of the other vessel, or

(ii) in the case of a power-driven vessel lighted in accordance with Rule 23(d) or (f), the all-round white light or lights of the other vessel.