There are so many nautical mistakes in this film that it would take hours for me to list them all. For one, there are no navigation lights (masthead, port and starboard) visible during the shot of the ship sailing at night. Also, the ship's officers and naval crew do not use the proper radio vocabulary when using the communication devices (for example, the word "repeat" is not used. The proper words are "Say Again"). I could go on and on. Did they even have any seafaring advisers for this film?
A woman is able to send a distress email even though the terrorists have cut all ship-to-shore communications, the ship is on emergency power, and the antennas and satellite dishes are underwater and pointed at the ocean floor.