Abstract: A driver-assist system for a marine vessel may include a camera operable to obtain data comprising images of a view of the camera, and a data processor. The data processor may be programmed to distinguish between portions of the view representing water and/or sky a portion of the view representing an object. The data processor may be programmed to detect an object by causing object detectors to search for objects in respective different subregions of the view. The data processor may be programmed to detect a boat in the view. The data processor may be programmed to cause the marine vessel to follow a detected boat.