What is required of Powerboat A when approaching the starboard side of Sailboat B in darkness or reduced visibility?

When Powerboat A approaches the starboard side of Sailboat B in darkness or reduced visibility, it is required to take measures to avoid a collision. Powerboat A should maintain a proper lookout, proceed at a safe speed, and be prepared to take evasive action if necessary. Additionally, Powerboat A must sound appropriate signals to indicate its presence and intentions, while also ensuring it adheres to the navigation rules that apply to the situation.