The ship that has the other ship on its starboard side needs to steer clear, while the other ship should maintain course and speed.
The ship that needs to steer clear should if possible make a maneuver so big that the other ship has no doubt that a maneuver has been executed...
ETA:
Rules of the Road
International
Steering and Sailing Rules
Rule 15
Crossing situation
When two power driven vessels are crossing so as to involve the risk of collision, the vessel which has the other on her own starboard side shall keep out of the way and shall, if the circumstances of the case admit, avoid crossing ahead of the other vessel.
Inland
(a) When two power driven vessels are crossing so as to involve the risk of collision, the vessel which has the other on her own 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) Nothwithstanding paragraph (a), on the Great Lakes, Western Rivers, or water specified by the Secretary, and proceeding downbound with a following current shall have the right-of-way over an upbound vessel, shall propose the manner of passage, and shall initiate the maneuvering signals prescribed by rule 34 (a) (i), as appropriate.
How the two vessels are propelled
vessels operator
the vessel operator
Starboard ( right side ) and it should be mounted so it is visible at 135 degrees .
When overtaking a power-driven vessel, a sailing vessel operator should ensure they are aware of the other vessel's course and speed. The operator should maintain a safe distance and communicate their intentions if necessary. According to maritime rules, the overtaking vessel must keep clear of the vessel being overtaken, typically passing on the starboard side. Finally, the operator should always be vigilant for any changes in the other vessel's movements to ensure a safe passage.
A pleasure craft operator can moor their vessel to a signal only in cases of emergency or when it is necessary to avoid immediate danger. Otherwise, it is not recommended to moor a vessel to a signal as it may obstruct navigation or pose a safety hazard to other vessels.
A sailing vessel operator when approaching a pwc head on should slow down and change course.
When approaching a sailing vessel head on, it is up to the motorboat to yield. The motorboat operator should swing wide as early as possible to stay well clear of the sailing vessel.
When operating south of Interstate Highway 10, a vessel operator should maintain a distance of at least 100 feet from any other vessel when jumping another vessel's wake or following a water skier. This distance helps ensure safety and reduces the risk of collision or accidents. Additionally, operators should always be aware of their surroundings and adjust their speed accordingly.
the vessel operator
The sailboat operator is the stand-on vessel so they should keep their course and speed while the PWC is the give-away vessel so it should change course and speed.
A vessel operator should keep a proper lookout to ensure the safety of the vessel, its crew, and other maritime users. By maintaining vigilance, the operator can detect potential hazards, such as other vessels, navigation aids, or environmental conditions, in a timely manner. This proactive approach helps prevent collisions and accidents, promoting overall maritime safety and compliance with navigational regulations. Additionally, a proper lookout enhances decision-making in critical situations, ultimately safeguarding lives and property at sea.