Which communications functions must all vessels be capable of performing under GMDSS as defined by the International Maritime Organization?

Correct Answer: Option B — Distress alerting to and from vessels, search and rescue coordination, on-scene communications, signals for locating, Maritime Safety Information, general and bridge-to-bridge communications.

IMO GMDSS regulations mandate that all vessels must perform nine functional requirements, including distress alerting, search and rescue coordination, on-scene communications, locating signals, and the reception of Maritime Safety Information. These functions are essential for the effective operation of the global maritime distress and safety system during emergencies.