Colleen, we were in the Caribbean on the Navigator last year during the Super Bowl. RSSC did a great job broadcasting the game - large screen and tailgate party on the pool deck. Lots of Steeler fans in full regalia. Perhaps there will be a similar setup on your cruise. It wouldn't hurt to check in with the social director when you board.
btw -- I'm a "still stunned" Yankees fan who realizes that the Tigers seem to be the team of destiny this year. Good luck and enjoy!!