What is the action required of a powerboat A when approaching sailboat B head on in the darkness or reduce visibility?

When a powerboat A approaches a sailboat B head-on in darkness or reduced visibility, powerboat A must take action to avoid a collision. According to maritime navigation rules, both vessels should alter their course to starboard (right) to pass each other safely. Powerboat A should also reduce speed and be prepared to take additional measures if necessary to ensure safe passage. Maintaining a proper lookout and using navigation lights is crucial in such conditions.