I'd consider all that electronic junk backups to a fine Weems and Plath Sextant, chronometer and a good set of charts along with Bowditch's Practical Navigator. After a year who knows what could happen to our technological umbellical cord. I'd include a small hydroponic garden or just some soil baskets for fresh vegetables. Spend some time at sea or in reduced light and all you want is something GREEN and FRESH. The souls needs nourishing too. I'd add some classical, jazz and The Beach Boys Greatest Hits and the classics of literature. I was helmsman on a cutter in a miserable storm. Most of the crew were sick in their bunks except the old man, the senior chief machinists mate and yours truly. The chief comes to the bridge to find the skipper and me singing The Ballad of the Sloop John B. and joined in on the chorus "this is the worst trip, I've ever been on." Common cultural bonds help on a long voyage too.