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Well you have omitted just about every form of shade that could be erected on the boat. You could try a Mexican sombrero! Just kidding a little there. I have a umbrella that was first used on the patio of a Mexican restaurant, Big yellow with a corona logo on it. It is heavy built and the pole is only slightly smaller than the inside diameter of a rod holder. I think if you were to mount a rod holder and get a umbrella with a large pole you could drill a hole in the pole and pass a cord through it to tie the umbrella when it was up .