We had a group of 13 in our party, in 4 staterooms, and this app was very helpful for keeping in touch via text. It made it much easier for us to let the older kids explore the ship and have fun on their own, since they were only a text away. Also, it was great to be able to see the scheduled events going on at any time. The only downside is we couldnt connect on Castaway Cay - only on the boat.
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