When is a sail boat the stand on vessel in relation to a recreational power boat?

A sailboat is considered the stand-on vessel when it is under sail and encountering a powerboat that is not under sail. In this scenario, the powerboat must give way to the sailboat, as sailing vessels generally have the right of way when they are on a collision course. However, if the sailboat is under power or if both vessels are sailing, different rules apply based on their respective points of sail. Always refer to the specific navigation rules for further clarity.