Cruise ships pitch and roll constantly. Staying dead locked on to a specific satellite requires some very sophisticated and expensive antennas. Not to mention that first priority for the available bandwidth belongs to the ships bridge, engineering, and hotel director. Trying not to be too harsh - people need to disconnect from the electronic world, pick up a good book, watch the sunrise & sunset, gaze upon the stars at night, and have a fantastic time on vacation. Or just stay at home.