46 C.F.R. § 108.713 International Code of Signals.
Title 46 - Shipping
Each vessel on an international voyage which is required to carry a radiotelegraph or radiotelephone installation in accordance with Chapter IV of the Safety of Life at Sea Convention, 1960, must carry the International Code of Signals.
Title 46: Shipping
PART 108—DESIGN AND EQUIPMENT
Subpart H—Miscellaneous Equipment
§ 108.713 International Code of Signals.