Sounds great - especially if you are more nautically inclined than me. I think there is a school of thought that any clouds will only form near the coast (orographic uplift) and that out to sea it will be clear. [Of course I'm hoping for clear skies everywhere.
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Photography has been done from the deck of a ship but the case I know of they were in the Black Sea, which had about as many waves as a swimming pool. The biggest source of vibration was when the Captain blew the ship's horn long and loud at second contact. Apparently the deck shook.