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A cruise ship ID card is a plastic card the size of a credit card that serves several functions for passengers on a cruise ship. Cruise ship ID cards are scanned at the entrances to the ship and at various points throughout the ship, either via magnetic strip, RFID readers or bar code in order to identify the passenger, allow entry to and exit off the ship, allow entry into certain areas of the ship, including the passenger's cabin, bill purchases to the passenger, and various other functions.