Every vessel lying alongside a wharf, or vessel lying alongside a vessel berthed at a wharf must, from sunset until sunrise, be provided with the proper lights, and must be provided continuously with the appliances in the way of gangways and manropes as may, in the opinion of the Harbor Master or in fact, be necessary for the convenience and safety of person passing to and from the vessel. Every gangway fixed for the purpose of giving the crew or other persons access to the ship after dark must be brightly illuminated by the best available means as long as such gangway is in use.