When is a radiotelegraph apparatus mandated on a passenger vessel?

A radiotelegraph apparatus is mandated on passenger vessels carrying 200 to 1499 passengers primarily for communication safety requirements. This regulation is based on the potential for increased risk associated with larger passenger capacities. Vessels in this capacity range are deemed to require robust and reliable means of communication for emergencies, navigation, and safety operations. The presence of a radiotelegraph system enhances the vessel's ability to send and receive distress signals and coordinate responses, which is critical for vessels operating in areas with high passenger loads.

While smaller vessels may use different communication systems, the unique needs of vessels carrying considerable numbers of passengers necessitate the radiotelegraph apparatus in this specific range to ensure enhanced safety and compliance with maritime regulations. This serves as a precautionary measure to protect both the passengers and the crew in emergencies or critical situations at sea.