Need help choosing a distro

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http://ubuntuforums.org – OK I have a low power system that will be running off 12 volt on a boat. I have an Intel Atom D410 processor with the on board Intel graphics 3 gigs of ram (what I could find that would work in the system, may upgrade to 4 gigs at some point) and a 128 gig SSD and a 15 inch touch screen monitor. My main application that will be running on it is Open CPN, a nautical navigation system. I do want to be able to run some entertainment type apps and perhaps some web browsing and basic office apps. So I am not gaming on it, or anything demanding. I currently have Mint installed and am running Mate, i (Hardware)