46 C.F.R. § 169.747 Watertight doors and hatches.
Title 46 - Shipping
Each watertight door and watertight hatch must be marked on both sides in at least 1-inch letters: “WATERTIGHT DOOR—CLOSE IN EMERGENCY” or “WATERTIGHT HATCH—CLOSE IN EMERGENCY”, unless the markings are deemed unnecessary by the Officer in Charge, Marine Inspection.
Title 46: Shipping
PART 169—SAILING SCHOOL VESSELS
Subpart 169.700—Vessel Control, Miscellaneous Systems, and Equipment
Markings
§ 169.747 Watertight doors and hatches.
