A trolling motor is a marine propulsion system consisting of a self-contained unit that includes an electric motor, propeller and controls, and is affixed to an anglers boat, either at the bow or stern. A gasoline-powered outboard used in trolling, if it is not the vessels primary source of propulsion, may also be referred to as a trolling motor. Trolling motors are lifted from the water to reduce drag when the boats primary engine is in operation.