Misconceptions about history certainly do abound and are hard to eradicate. The word "posh" is often thought to have originated in Britain in the days of empire. It was thought that tickets were marked, Port Out-Starboard Home, for the most comfortable cabins avoiding the harsh afternoon sun. It's a great story but for the fact that it ain't true.
While we're venting our spleens here, and for lack of a better place to say it, the phrase "down below" applied to vessels is redundant. The word "below" as in, lay below or went below, is sufficient unto itself , not to mention correct, and the addition of "down" adds no additional information, is redundant, and lubberly. And I'm glad I finally got that one off my chest! Don't make me bring up the topic of sheaves versus pulleys.(g)
“Scientists are people who build the Brooklyn Bridge and then buy it.”
Wm. F. Buckley, Jr.