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Message: <blockquote data-quote="chscag" data-source="post: 1153497" data-attributes="member: 46727">Cruise ships are not all alike.  The more modern ones have fairly good filtering and usually maintain steady voltage across all parts of the ship.  However, it's not the voltage surges so much that will kill batteries and charging systems, it's the "squaring off" of the voltage.  In other words, it's not always a steady smooth 60 Hz sine wave.What I suggest is to buy a good quality UPS (uninterrupted power supply) and take it along with you.  Plug the UPS into the ship's power outlet and then plug your MacBook into the UPS.  That will insure your MB is receiving clean steady power to charge.A good quality UPS may cost anywhere from $100 to $200 or more depending on its capacity.  But what's more important is the type of filtering it's capable of.  So do your homework before you buy.</blockquote>