A power-driven vessel on collision course with a sailing vessel must:

In maritime navigation, the responsibilities of vessels when encountering one another are guided by the "Rules of the Road," which help to prevent collisions. According to these rules, a power-driven vessel has specific obligations when it is on a collision course with a sailing vessel.

When a power-driven vessel is approaching a sailing vessel directly, it is required to take action to avoid the impending collision. The safest and most effective action in this scenario is to change course to pass at a safe distance. This action is necessary because the sailing vessel may have the right of way if it is under sail alone. By changing course and altering the vessel's path to ensure a safe distance from the sailing vessel, the power-driven vessel demonstrates adherence to safe navigation practices and contributes to the overall safety of the waterways.

Maintaining its course could lead to a collision, which is contrary to the obligations of the power-driven vessel. Stopping immediately may also not be practical or safe, as it could create additional hazards for navigation. Speeding up could exacerbate the situation and increase the risk of collision rather than mitigate it. Changing course to pass safely is the most responsible and compliant action in this scenario.