Wayne,
You might want want to look at something like this for something to carry
on your boat. It's not street legal but it might be suitable for your needs.

I had a 500Watt version up until 4 days ago when someone a stranger decided
they needed it more than I did. I ordered this one from walmart.com at $284.
I plan on keeping this one chained at night when left outdoors.
http://www.currietech.com/currie-tec...ic-scooter.php