Hmm. I'm thinking my large desktop hackintosh is not going to make it to the liveaboard. So much for the "Ship's Computer".
Good think I have a macbook too!
All this talk of redundancy and netbooks is making me think about long-term redundant navigation solutions, such as hackintoshing one, cloning the SSD, and dupeing it on a couple backups. Updates to data could be done automatically using Time Machine, on a drive sealed in plastic containing rice or salts to keep it dry.