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

Correct Answer: Option D — 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 functional standards require vessels to independently perform shore-to-ship alerting, ship-to-shore alerting, ship-to-ship alerting, search and rescue coordination, on-scene communications, locating signals, Maritime Safety Information (MSI) reception, and bridge-to-bridge communications.