The smaller, older carnival ships use separate room keys and S&S cards. Also, the Sensation room safe uses any card you want to use that has a magnetic strip to open and close. You CAN NOT use your SS card and it says not to right on the safe.
I used my room key from the hotel I stayed in the night prior to boarding and it worked just fine.
You will want to take some card to use that won't be a big loss if it's demagnetized by the safe. I wouldn't risk a credit card or ATM card!
another good tip: just like with any credit card; do not keep your Sail and Sign card in the same pocket or right next to your cell phone, it will screw up the card; which won't usually be a problem utnil they try to swipe the strip as you are getting on and off at the ports...
Carnival Victory March 9, 2013
*carnival dream *
Glory 2/28/2010: Dina & Marty
Valor Feb 2009: Dina & Marty - again
Grandeur Feb 2008: DTW, Dina & Marty
Inspiration May 26, 2007
Fascination: Feb 2007
Enchantment of Seas: Sept 2006
Radiance of the Seas
Majesty of the Seas
The Big Red Boat