And tracking your minute use even if you use the cafe computers is a good idea. We ran into two cases where something got fowled up and we never actually got "logged off". The IT guy in the the cafe credited our account with the minutes we lost but you need to know how many you lost.
The other point... especially if using the ships computers... write your email and have it saved/ready to send BEFORE you log in to send it. You will need to use a web based mail service (since you are not really connected to your provider and their mail servers) It a real minute waster to log in and then be burning minutes composing a email on the web email page. Especially if you lose the connection before you can hit the send button. As slow as the connection is, you can burn through 3 or 4 minutes just logging into your mail account, copying in you email text and hitting send...
Carnival Cruise Lines:
Fantasy 90, Celebration 95, Victory 05, Conquest 05, Spirit 6/06, Freedom 6/08, Holiday 7/08, Victory 6/09, Valor 9/09, Dream 6/10, Splendor 8/10,Conquest 8/11,Magic 11/11,Triumph 4/12,Spirit 7/12,Freedom 11/12, Triumph 2/13 - The fire cruise, Magic 1/14, Freedom x 2 6/14
NCL Dream October 2006, RCCL Mariner OTS June 2007, Celebrity Silhouette 2013