Question 1520Navigation General

The correct answer is D) A siren or rotating flashing light. Facilities that handle hazardous cargoes like chlorine, butane, or ethane are required to have a means of warning water traffic of an immediate danger during a fire or cargo release. Specifically, regulations mandate that these facilities have a siren or rotating flashing light to alert nearby vessels of the emergency situation. This allows other watercraft to quickly become aware of the danger and take appropriate action, such as moving away from the affected area. The other answer choices are incorrect because they do not fully meet the regulatory requirements. Buoys with flashing lights (A) or just flashing red lights (B) may not provide a sufficiently attention-grabbing warning, while an emergency boat and crew (C) would not actively notify vessels of the hazard.