46 C.F.R. § 122.330 Hatches and other openings.
Title 46 - Shipping
(a) Except when operating on lakes, bays, and sounds, or river routes in calm weather, all hatches and openings in the hull, except loading doors, of a vessel must be kept tightly closed except when being used. (b) All watertight doors in subdivision bulkheads must be kept tightly closed during the navigation of the vessel except when being used for transit between compartments.
Title 46: Shipping
PART 122—OPERATIONS
Subpart C—Miscellaneous Operating Requirements
§ 122.330 Hatches and other openings.
