A helmsman or helm (sometimes driver or steersman) is a person who steers a ship, sailboat, submarine, other type of maritime vessel, or spacecraft.
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A ship's captain generally does NOT have the legal right to officiate a wedding at sea. In order for a Captain of a ship to perform a marriage at sea, he must also be a judge, a justice of the peace, a minister, or an officially recognized officiant such as a Notary Public.