Not much has changed in the world of single-burners since Powerboat Reports last reviewed them in March 2002. Some have seen minor updates, but many are still not built for galley cooking, and they lack the fuel capacity for full duty on an extended cruise—unless you have room to stow a few dozen fuel bottles. But they do serve their purpose: They’re great for day and weekend trips, and the sea-swing style stoves are handy during those rough-weather rides or for a quick bowl of soup. …