Final answer:
The primary purpose of the Navigation Rules is to prevent collisions between vessels.
Step-by-step explanation:
The primary purpose of the Navigation Rules is to prevent collisions between vessels. These rules, also known as the International Regulations for Preventing Collisions at Sea (COLREGS), establish guidelines that all mariners must follow to ensure the safe navigation of their vessels. These rules cover various aspects of vessel navigation, including right-of-way, lights and shapes, sound signals, and general conduct at sea.