; (ii) readily accessible during an emergency; and (iii) capable, in accordance with the Coast Guard capacity rating, when applicable, of safely holding all individuals on board the vessel to which the craft functions as an auxiliary. (3) At least one readily accessible immersion suit for each individual on board the vessel when operating on the waters described in section 3102. (4) Marine radio communications equipment sufficient to effectively communicate with a land-based search and rescue facility. (5) Navigation equipment, including compasses, nautical charts, and publications. (6) First aid equipment and medical supplies sufficient for the size and area of operation of the vessel. (7) Ground tackle sufficient for the vessel. (c) Accountable vessels In addition to the requirements described in subsections (a) and (b), the Secretary may prescribe regulations establishing minimum safety standards for accountable vessels, including standards relating to— (1) navigation equipment, including radars and fathometers; (2) lifesaving equipment, immersion suits, signaling devices, bilge pumps, bilge alarms, life rails, and grab rails; (3) fire protection and firefighting equipment, including fire alarms and portable and semiportable fire extinguishing equipment; (4) use and installation of insulation material; (5) storage methods for flammable or combustible material; and (6) fuel, ventilation, and electrical systems. 4504. Vessel construction A vessel to which this chapter applies shall be constructed in a manner that provides a level of safety equivalent to the minimum safety standards the Secretary may establish for recreational vessels under section 4302, if the vessel is— (1) is a subject vessel; (2) less than 50 feet overall in length; and (3) built after January 1, 2010. 4505. Operating stability (a) Regulations The Secretary shall prescribe regulations for the operating stability of a vessel to which this chapter applies— (1) that was built after December 31, 1989