Dumb question here..... but Im not a boater or sailor

Im curious as to what "specific" equip most people use
to watch TV on their boats?

Do you buy smallish LCD flat panel TVs and outdoor
antennas designed for mounting on a boat?

Do you make your own TV/Tivo by installing a
specialized video board into a PC and use that?

Do you just not HAVE any type of TV equip at all?

Thanks in advance