To update my own post, I just came back from a wonderful 14-day trip to South Georgia and Antarctica. Even though the printed package that I've received said I get 150 MB per stateroom, in reality, after we board the ship World Navigator, my wife and I actually received an access code for 1 GB each. We've turned off just about everything except necessary apps that we use to keep contact and only turn on wifi to do a quick refresh, reply email, etc. then turn off wifi. I ran out of my data about 4 days before cruise ends. Additional 1 GB is $80, so I didn't bother to buy it.