The most critical part of boating to avoid collisions is maintaining a proper lookout and staying alert at all times. This involves continuously watching for other vessels, obstacles, and changes in conditions, using sight and hearing, and being prepared to take action well in advance to prevent collisions. Operating at a safe speed, understanding navigation rules, and using common sense also play essential roles in collision avoidance. Keeping a proper lookout is legally required and is the key safety responsibility of every boat operator to ensure safe navigation and avoid accidents on the water.