Data connection is available about for 30 minutes after departing at Macau ferry terminal. Enjoy internet connection on a ferry. Turbo Jet出発後30分程度は海上でもInternet通信可能。
You should book your return ticket ahead of time because the queues going back to Hong Kong and/or Kowloon are very long. Also, If you want to go to the Ruins of St Paul, you should take the shuttle.
You can take earlier ferry. Just go to the boarding gate and show your ticket. If refused, wait on the standing line and there will be call around departure time