Excellent!
The app is great to have event listings/reminders and ship maps, but the killer feature is the chat functionality. All features except chat are free on the ship. You dont pay for wifi service on the ship for this.
The chat as of 05/14/2016 costs $5/user. This is well worth the price though as it makes grouping up with folks much easier. You can also add the chat IDs of other folks that you meet if you want to hang with them again.
Very, very useful!
It would be even more awesome if they integrate this with the ships telephone system so you could get notified if someone calls or leaves a voicemail on the room phone.
Bionicthumb about
Carnival HUB, v1.2.4