Brian Whatcott wrote:

Ah, you can support the connection between ship's head and
sanitary head, because, in your view, there is not properly a plural
sanitary term in nautical use: "heads"


Brian...you're WAAAAY overthinking it! It's actually a VERY simple
concept: bow of boat aka the vessel's "head"...plank extending from
"head" of vessel...sailors who came to think of the need to visit it as
"using the head"...resulting in that name being given to all future boat
toilets regardless of location.

IMO, the origin of the name "bridge" for a vessel's command center is
far more entertaining.
--
Peggie
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Peggie Hall
Specializing in marine sanitation since 1987
Author "Get Rid of Boat Odors - A Guide To Marine Sanitation Systems and
Other Sources of Aggravation and Odor"
http://www.seaworthy.com/store/custo...0&cat=6&page=1