Is it possible to obtain hot, kosher meals on a cruise ship?

The only practical option for hot meals on a non-kosher cruise ship is to eat certified pre-packaged meals that are double wrapped, such as those found on airplanes.  These may be heated in any oven as long as the seals are intact and the package remains closed.  (There are other halachic concerns that arise on a cruise ship pertaining to Shabbat that have not been addressed here. Please ask your rabbi for guidance.)