A steering control fin for mounting to a trolling motor includes a skin formed into a substantially symmetric closed fin shape having a fin width. The skin has a first end surface contoured to match the shape of a motor, and a trailing edge having an anti-rotation interlock cut-out near the first end surface. A reinforcement collar has a reinforcement collar surface that substantially matches the first end surface. An internal support structure is mechanically coupled to the steering control fin to provide a structural support which maintains the substantially symmetric closed fin shape. An end cap skin is mechanically coupled to a second end surface of the skin. One or more mounting straps are mechanically coupled to the skin and each of the reinforcement collars. The mounting straps mechanically affix the control fin to the trolling motor. A method of maneuvering a boat or ship is also described.