An attachment for use with a boat lift that both lifts the watercraft out of the water and allows horizontal movement of the watercraft to a position over a dock. The apparatus provides a vertical extension to the central mast of the lift apparatus. A horizontal arm attached to the distal end of the vertical extension provides an attachment point for a cable, which may be connected to the watercraft while still afloat. Raising the mast raises the suspended watercraft above the water while a cradle assembly upon which the hull of the watercraft normally rests is disposed a predetermined distance below the hull. Once the hull is raised above the dock, the vertical mast rotates to position the watercraft over the dock. The cradle is positioned underneath the dock. The watercraft may be lowered onto the dock with no intermediate structure between the hull and the dock surface.