To operate a radio on board a commercial vessel, you must have a Marine Radio Operator Permit (MROP) issued by the Federal Communications Commission (FCC).  

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To obtain the permit you will need to pass the MROP exam which can be done at the Captain School USVI on most Mondays and Wednesdays or by appointment. 

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The study guide is available here by clicking the link.

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The permit is issued for life. There is a one time fee of $130.