This is one of the dozen or so ferries that take people across Recife harbor. Two have outboards (one of which is reliable, one isn't), the rest are solely powered by oars.

One day, on a trip across in the ferry with the unreliable outboard, I had the opportunity to row the boat while the owner was cleaning the spark plug to get the engine restarted. The engine did restart, but I'd rowed to the other side by the time it did. The boats are relatively heavy, flat-bottomed wooden boats, and row slowly but surely.