I did a web search and found this in a review of the movie "Song of the Thin Man"

" Manhattan meets the hip jazz scene in this one as Nick and Nora are involved in solving another delicious murder, with nice touches from Nicky Jr., and of course, their dog Asta. It begins when Nick and Nora have a night out on the gambling ship "S. S. Fortune"."

Of course the movie could have been based on an actual ship too I suppose....

Chas