GMDSS is primarily a system based on?

Official USCG Answer & Rule Citation

Correct Answer: Option D — The linking of search and rescue authorities ashore with shipping in the immediate vicinity of a ship in Distress or in need of assistance.

Under USCG National Maritime Center examination standards, the accepted correct answer is: The linking of search and rescue authorities ashore with shipping in the immediate vicinity of a ship in Distress or in need of assistance..

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