What is the key principle of Rule 13?

Answer: B — The vessel that has the other on its starboard side must keep out of the way

The key principle of Rule 13 focuses on the responsibility of vessels when they are meeting one another at an angle, particularly regarding the right of way. This rule states that when two sailing vessels are approaching each other, the vessel that has the other on its starboard side must keep out of the way. This is essential in preventing collisions and ensuring safe navigation. Understanding the rule's implication helps mariners determine the necessary actions to take when encountering other vessels. When one vessel has another on its starboard side, it means that the other vessel is to its right; thus, that vessel is considered the privileged vessel with the right of way. The other vessel must yield, effectively helping to establish clear decisions on how to maintain safety at sea. The other answers refer to concepts that are not aligned with Rule 13. The idea of the wind direction affecting right of way (option A) pertains more to navigating under sail rather than the rules for vessels crossing in the water. As for vessel draft (option C) and speed (option D), these factors do not specifically dictate navigational responsibilities as outlined in this particular rule, leading to potential misunderstandings when it comes to collision avoidance under maritime law.