Do the sailboat had no choice but to tack to avoid shoals? Anyhow, I believe that the Dinner-boat will have an indigestion since …
Rule 13, Overtaking
(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.
(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 8, Action to avoid Collision
(d) Action taken to avoid collision with another vessel shall be such as to result in passing at a safe distance. The effectiveness of the action shall be carefully checked until the other vessel is finally past and clear.
(e) If necessary to avoid collision or allow more time to assess the situation, a vessel shall slacken her speed or take all way off by stopping or reversing her means of propulsion.
(f) (i) (ii) (iii) …
Rule 18, Responsibilities between Vessels
(a) A power-driven vessel underway shall keep out of the way of:
(iv) a sailing vessel.
Rule 34, Manoeuvring and Warning Signals …