If I'm not mistaken, gps does not use wifi or cell signal. It gets its signal from the satellites. So, if an ipad is GPS capable, I'd suspect you could use it as a gps on a sailboat. I don't know how good their gps apps are for marine navigation.Any experience and recommendations on Ipad navigation apps, and the functionality of Ipad GPS on a sailboat? I s full time wifi or cellular connection required, which makes this pretty unusable?