Aboard ship, SafetyNETTM messages can be received by which method?

SafetyNET™ is a maritime communication system used for the broadcast of safety messages and maritime safety information (MSI). It operates primarily through the Inmarsat satellite network. The correct method by which SafetyNET™ messages can be received is through the Enhanced Group Call (EGC) receiver of a vessel's Inmarsat-C Ship Earth Station (SES). This system provides a reliable means to receive crucial safety alerts, navigational warnings, and meteorological updates directly from the satellite system.

The other methods listed do not facilitate the receipt of SafetyNET™ messages. For instance, while VHF DSC on weather channels is used for distress and safety communications, it is not compatible with the SafetyNET™ service. Similarly, NAVTEX, although it provides MSI, operates over a different frequency and is not related to the SafetyNET™ system. HF SITOR (NBDP) MSI frequencies also do not handle SafetyNET™ message transmissions, as this service is specifically designed for the satellite communication medium utilized by Inmarsat.

Thus, the EGC receiver of the vessel's Inmarsat-C SES is the correct answer, as it directly interfaces with the SafetyNET™ service.