Page:United States Statutes at Large Volume 94 Part 3.djvu/777

 PUBLIC LAW 96-591—DEC. 24, 1980

94 STAT. 3421

(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. RULE 14

Head-on Situation (a) When two power-driven vessels are meeting on reciprocal or ^^ USC 2014. nearly reciprocal courses so as to involve risk of collision each shall alter her course to starboard so that each shall pass on the port side of the other. (b) Such a situation shall be deemed to exist when a vessel sees the other ahead or nearly ahead and by night she could see the masthead lights of the other in a line or nearly in a line or both sidelights and by day she observes the corresponding aspect of the other vessel. (c) When a vessel is in any doubt as to whether such a situation exists she shall assume that it does exist and act accordingly. RULE 15

Crossing Situation (a) When two power-driven vessels are crossing so as to involve risk 33 USC 2015. of collision, the vessel which has the other on her starboard side shall keep out of the way and shall, if the circumstances of the case admit, avoid crossing ahead of the other vessel. (b) Notwithstanding paragraph (a), on the Great Lakes, Western Rivers, or water specified by the Secretary, a vessel crossing a river shall keep out of the way of a power-driven vessel ascending or descending the river. RULE 16

Action by Give-Way Vessel Every vessel which is directed to keep out of the way of another ^3 USC 2016. vessel shall, so far as possible, take early and substantial action to keep well clear. RULE 17

Action by Stand-on Vessel (a)(i) Where one of two vessels is to keep out of the way, the other 33 USC 2017. shall keep her course and speed. (ii) The latter vessel may, however, take action to avoid collision by her maneuver alone, as soon as it becomes apparent to her that the vessel required to keep out of the way is not taking appropriate action in compliance with these Rules. (b) When, from any cause, the vessel required to keep her course and speed finds herself so close that collision cannot be avoided by the

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