A '''voluntary ship''' is any ship which is not required by treaty or statute to be equipped with radiotelecommunication equipment.
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A '''voluntary ship''' is any ship which is not required by treaty or statute to be equipped with radiotelecommunication equipment.<ref>U.S. Department of Transportation Maritime Administration [http://www.marad.dot.gov/publications/glossary/glossary.html]</ref>
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<ref>U.S. Department of Transportation Maritime Administration [http://www.marad.dot.gov/publications/glossary/glossary.html]</ref>