Reply To: JoCo Cruise Crazy 3: All About the Ship
In order to use the machines, you have to buy their soda package (6.50/day for adults). You also have to use the souvenir cup they give you with the package, since that is fitted with an RFID tag that the machine reads. Here is an USA Today article on it:
http://travel.usatoday.com/cruises/post/2012/09/royal-caribbean-coke-machine-cruise/832730/1