What equipment is typically required on commercial vessels under the RRO?

The correct choice highlights the equipment that is mandated for commercial vessels regarding safety and communication under the Restricted Radio Operator regulations. A VHF radio is essential because it allows for reliable voice communication over short to medium distances, which is critical for safety and coordination with other vessels and shore stations. An Emergency Position-Indicating Radio Beacon (EPIRB) is also required, as it automatically transmits a distress signal that can be detected by search and rescue satellites when a vessel is in trouble, significantly increasing the chances of a swift rescue. Additionally, life-saving devices, which can include lifeboats or life rafts, are crucial for ensuring the safety of crew and passengers in the event of an emergency.

The other equipment mentioned in the choices is either not specific to mandatory requirements under RRO regulations or complements the basic communication and safety needs. For instance, while SATCOM devices are advanced communication tools, they are not typically required equipment on all commercial vessels. Similarly, relying solely on a VHF radio does not fulfill the comprehensive safety requirements established for commercial operations. Lastly, flares and signal mirrors, although useful for signaling distress, do not meet the established standards for mandatory equipment in the context of communication and safety management as outlined for commercial vessels by marine authorities.