(1)Every sea-going vessel aground in the port in or near a fairway(a)shall during night exhibit the lights required by rule 11(e) of the aforesaid Regulations, provided that such vessel shall, when in tow, exhibit immediately she starts to make way over the ground the lights required by rule 34 of these rules; and(b)shall, during day, hoist in place of the red lights mentioned in rule 11(e) aforesaid, three black balls.2 feet' in diameter and six feet' apart.
