When is the sailboat the stand on vessel in relations with a recreational power boat?

In maritime navigation, a sailboat is considered the stand-on vessel when it is under sail and the powerboat is approaching it. According to the "Rules of the Road," the sailboat has the right of way, and the powerboat must take action to avoid a collision. However, if the sailboat is also using its engine, both vessels must follow the same rules as powerboats, where they must give way to the more maneuverable vessel.