Make something foolproof and only a fool will want to use it. Your design sounds great to somebody who's never used a GPS before, but somebody with experience will pick holes in it right away: why pay to make a car GPS waterproof or useable with gloves? Why fit a bike unit with cigarette lighter sockets? What about wifi security? What if you have thousands of routes or POIs and don't want to sync them all?
My advice would be to buy a Garmin and learn to use it. They've been making marine and aviation GPS for decades and it shows. Once you're over your initial techno-fear reaction you'll appreciate why it needs to be that "complicated"  )
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More malformed, irrelevant opinions here.
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