Which element is essential for a vessel using SafetyNETTM?

A working satellite connection is essential for a vessel using SafetyNETTM because this service is designed to provide maritime safety information via satellite. SafetyNETTM broadcasts navigational warnings and other safety-related messages to vessels in the ocean through the Inmarsat satellite system. Without a functioning satellite connection, the vessel would not receive these important updates, which could jeopardize maritime safety.

The other options, while they might be relevant in specific contexts, do not directly address the fundamental requirement for SafetyNETTM operation. The reliance on satellite technology for receiving time-sensitive maritime safety information underscores the importance of a continuous and reliable satellite connection for successful operations.