Which action is required when two boats are approaching each other in the darkness?

When two boats are approaching each other in darkness, they must take action to avoid a collision. Each vessel should use its navigation lights to signal its position and intentions. The standard rule is that the boat on the right (starboard) has the right of way, while the other boat should alter its course to avoid a collision. Additionally, both vessels should reduce speed and be prepared to take evasive action if necessary.