You're going to be on a sailing ship - bobbing along with the ocean waves and wakes. Why take the 4x5 unless there are significant onshore stops? And those are likely to be port calls - not excursions into the countryside.
Originally Posted by wager123
So I'd skip the 4x5 altogether.
Then, I'd take the entire 330 kit which will cover the range from landscape to close-in for film.
As to the 20D - I'd take the 70-200 (but might sneak the 24-70 into my wife's bag when she isn't looking )
I'd leave the digi-wide at home. Film is better for the landscapes and you'll have that covered with the 330.