This has turned into such a great thread!!

I have never seen a comprehensive list of options for cup holders like this before. Hopefully, this will help other sailors in the future, too! Thank you, ALL of you, who have responded with your solutions.

There are a lot of good ideas here that we didn't know about, or hadn't considered.
Clearly, this is a
very important decision that best be made after many nights consuming numerous libations in the cockpit of our boat with friends. In the meantime, we will use
@rpludwig 's solution of a gimbaled left or right hand.

And after our
comprehensive and
thorough study, we will decide which solution works best for us.
So far, of all of the above, the leading contender, for our purposes, is
@Gene Neill 's suggestion.
