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Practice 600 real U.S. Coast Guard GMDSS exam questions from Element 7. Here's a random one. Answer it, then keep going with Next.
GMDSS radio operating practices: digital selective calling, INMARSAT, NAVTEX, EPIRBs, search and rescue transponders, and distress, urgency, and safety procedures.
These are the published GMDSS Element 7 questions covering radio operating practices: DSC, satellite communications, NAVTEX, EPIRBs, and distress procedures. The GMDSS Radio Operator exam draws from this pool.