When did GMDSS become fully effective?

• A. February 1, 1999
• B. January 1, 1999
• C. February 1, 1988
• D. June 1, 1999

Answer: (A)

Understanding when GMDSS became fully effective hinges on the timeline of SOLAS requirements. The Global Maritime Distress and Safety System was introduced through SOLAS amendments and was rolled out in phases, with initial carriage requirements appearing in the early 1990s and expanding over several years. The date that marks full effectiveness is February 1, 1999, when the entire GMDSS framework had to be in place on international ships and all the specified capabilities were required to be operational.

That means the other dates aren’t the official full-effect date: the amendments were adopted in 1988, but the system wasn’t fully mandatory until 1999, and the specific dates like January 1 or June 1 don’t correspond to the required full implementation deadline.