Boat Operators are required to always maintain a proper lookout.
Explanation:
According to the United States Coast Guard Boating Safety Guidelines, it is the responsibility of the Boat Captain to maintain an unobstructed view from the helm.
Rule 5 states that every vessel shall always keep proper lookout by (visually and audibly) and to with every resource available ensure they make full appraisal of the circumstances as well as the risk of colliding with another object.
