iPad and iSailor with a Dual external GPS ($99.00 Amazon) is what I use. You can import and export all your routes in .gpx format so transferring from say Garmin to iSailor or vice versa is a piece of cake.
Mine is not a wifi version. Wifi is great when you are within range but useless otherwise. Is the added cost worth it? That's for you to decide.
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What kind of boat is that?
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