In a perfect world, boat owners would get gas for their marine engines that does not contain ethanol.
But the world is not perfect and finding gas today without ethanol is nearly impossible. Many marinas will carry E10 ethanol fuel, meaning that the gas has 10 percent ethanol. E15 gasoline has also been approved but only for certain applications (i.e. cars made after 2007), but not for use in marine or small engines.