This App only works on the cruise ship after it has left the dock. I use the word "works" lightly as it leaves much to be desired interactively. The best part of the app is having the cruise ship's itinerary at your fingertips, but as for the group chat ($5 per person) leaves a lot to be desired as it works a little over half the time and usually doesn't tell you the time a person send a message (within 2-4hrs) and does not make a sound. You constantly have to check the app to stay connected.