George V was on the throne then. So if it were a royal ship, which it wasn't, then it would be his majesty's ship Titanic (HMS Titanic). The prefix RMS which

George V was on the throne then. So if it were a royal ship, which it wasn't, then it would be his majesty's ship Titanic (HMS Titanic). The prefix RMS which was used for the Titanic means Royal Mail Ship. i.e. it delivered mail. </pedant>