Designing a autopilot for a sailboat

ANyone know how to approach a design for a laptop to pilot a boat by reading a compass. I have been told JINI to get a output reading from the compass and then an output of different volts to change the servo for a sterring system????????????? Any suggest.....

I'd recommend using more than just a compass to determine what's happening... currents and prevailing winds will both have an impact on where the boat is - enough so that your boat could be (nautical) miles from where it is supposed to be at any particular time. I'd recommend looking into GPS if you want any kind of (even short-term) accuracy.
Keep in mind also for a sailboat that the sail settings are important to optimise wind usage - is your laptop going to be able to reset the sails to tack directly into the wind?

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