Royal Caribbean has teamed up with DeFi to create an iPhone application specifically for guests abroad its cruise ships. Royal Connect allows guests to communicate with family and friends on the ship, make various reservations, and get updates on cruise activities. Parents can also use the application to keep track of where their kids are. through location updates from RFID wristbands. The technology is currently in use on Oasis of the Seas, the world's largest cruise ship. Guests can rent a handheld device preloaded with the Royal Connect software for $18.